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These compact, production-grade diamond core bits are engineered for fast, clean stone drilling on both hand drills and table drills. With a total length of just 67 mm, they offer excellent control in tight spaces while tuned metal-bond segments deliver quick starts, steady feed, and smooth hole edges in granite, marble, and porcelain. Ideal for countertop installers, tile setters, and stone workshops that need reliable performance without sacrificing safety or finish quality.
• Metal bond with precision diamond segments
The metal-bond matrix holds high-quality diamond grits in an optimized pattern, maintaining a sharp cutting edge on granite, marble, porcelain tile, and engineered stone. This design supports fast penetration with less burnishing and fewer edge defects around the hole.
• Compact 67 mm body for better control
With a total length of 67 mm, the bit stays close to the drill, reducing runout and improving hole roundness. The short body is especially useful near backsplashes, corners, and tight mounting areas where longer core bits are hard to control.
• Optimized for construction hole cutting
From faucet and mixer holes in kitchen tops to penetrations for anchors and hardware, the bit provides a stable entry and guided feed. Installers spend less time correcting misaligned holes and more time finishing the job.
• Operator-safety focused design
The bit is compatible with wet cooling and designed for predictable cutting action. When used with water, heat and dust are significantly reduced, lowering the risk of overheating and improving day-to-day operator safety.
• Color & finish options for easy inventory
Available in black, red, or custom spray-painted finishes, these bits are easy to identify by size at a glance. The coating adds corrosion protection and keeps inventories looking clean and professional in your warehouse or on the service van.
Note: Wet drilling is strongly recommended on stone to improve edge quality and extend tool life.
Countertop cut-outs (granite and marble)
When drilling faucet and accessory holes in polished stone countertops, the compact 67 mm body keeps the drill stable and reduces wobble. Under light, controlled feed, the metal-bond segments grind efficiently and minimize chip-out around the hole, even close to edges and corners.
Porcelain and ceramic wall penetrations
Dense porcelain tiles can be unforgiving. By combining intermittent “pecking” (short in-and-out movements) with water cooling, the bit stays cool and the diamonds keep cutting freely. Color-coded finishes help installers quickly grab the correct diameter while working on ladders or scaffolding.
Workshop table drilling on drill presses
On drill presses or table drills, the short body and controlled RPM allow precise perpendicular entry. With continuous coolant supply, you can achieve repeatable hole diameters for hardware, fixtures, and anchors, reducing rework and improving fit-up tolerance in production environments.
1. Start at an angle to prevent skating
Mark the drilling point, then place the bit on the surface at roughly a 45° angle. Gently start the drill so the diamonds bite into the surface and create a shallow groove. This prevents the bit from wandering on polished stone or glazed tiles.
2. Bring the drill upright and continue with light feed
Once the groove is established, slowly lift the drill into a vertical position and continue drilling with steady, light pressure. Avoid forcing the bit; let the diamonds do the work.
3. Use wet cooling on stone
Whenever possible, use water to cool the bit and the workpiece. The water cools down the tool more effectively, so there is also a smaller risk of overheating-related hazards. Wet cooling helps carry away slurry, exposes fresh diamonds, and reduces chipping at the hole edge.
4. Use pecking on dense porcelain
On very hard porcelain, drill in short bursts, periodically pulling the bit out to allow water and slurry to clear. This “pecking” technique keeps the segments open, maintains cutting speed, and extends tool life.
• Speed and safety in one tool
The segment design supports fast drilling while keeping temperatures under control when used with water, helping contractors hit their schedule targets without compromising safety.
• Inventory clarity for multi-site teams
Color-coded black/red/custom finishes make it easy to pick the correct size quickly. The spray finish adds corrosion resistance, protecting stock in humid environments and during long storage periods.
• OEM-ready for large buyers
As a professional manufacturer and supplier of diamond tools, SENMINE can tailor diameters, colors, thread types, labeling, and packaging to your internal SOPs. This ensures consistent performance and presentation across different teams, branches, and regions.
• Can these bits run on a regular hand drill?
Yes. These diamond core bits are designed for use on both regular hand drills and table drills. For best results, keep the RPM moderate, avoid excessive pressure, and use water cooling on stone.
• What diameters are available as standard?
Standard diameters range from 6.5 mm up to 50 mm outer diameter, covering most common faucet, accessory, and anchor hole sizes. Larger or non-standard diameters can be produced under OEM orders.
• Which cooling method should I use on stone?
Wet drilling is strongly recommended for granite, marble, and porcelain. Water cooling manages heat, exposes fresh diamonds, improves edge quality, and reduces the risk of micro-cracks.
• How can I reduce entry chips on polished stone?
Apply masking tape over the drilling point, start at a slight angle to prevent skating, then bring the drill upright. Use a guide or template to control the position, keep the feed light, and use water to support a clean edge.
• Are these bits suitable for concrete as well?
They are optimized for stone and tile. For heavy concrete or reinforced concrete, we recommend using dedicated concrete core bits from SENMINE designed specifically for that application.
• Close-up: metal-bond diamond segment detail on a 20–35 mm bit.
• In-use: hand drill with water feed drilling a faucet hole in granite (show slurry evacuation).
• Color lineup: black/red/custom bits arranged by diameter for quick ID.
• Press setup: table drill fixture showing perpendicular entry and coolant management.
Specify the exact diameters and colors you need, and we'll build a set that matches your workflow. Speak with SENMINE—a trusted manufacturer and supplier of diamond tools for stone. Contact Us for a quote, lead times, or an OEM sample pack.
| Thread | Diameter/mm | Length/mm | Diameter/mm |
| M14 M10 1/2gas Hexagonal | Φ6.5 | 67mm | Φ25 |
| Φ8.5 | Φ26 | ||
| Φ10 | Φ30 | ||
| Φ12 | Φ33 | ||
| Φ14 | Φ37 | ||
| Φ16 | Φ40 | ||
| Φ19 | Φ50 | ||
| Φ20 | |||
| We also accept custom requests for different sizes. | |||
Tips: When using a hand electric drill, make a mark on the cutting material in 45 degree angle. Then you can drill holes in vertical.
These compact, production-grade diamond core bits are engineered for fast, clean stone drilling on both hand drills and table drills. With a total length of just 67 mm, they offer excellent control in tight spaces while tuned metal-bond segments deliver quick starts, steady feed, and smooth hole edges in granite, marble, and porcelain. Ideal for countertop installers, tile setters, and stone workshops that need reliable performance without sacrificing safety or finish quality.
• Metal bond with precision diamond segments
The metal-bond matrix holds high-quality diamond grits in an optimized pattern, maintaining a sharp cutting edge on granite, marble, porcelain tile, and engineered stone. This design supports fast penetration with less burnishing and fewer edge defects around the hole.
• Compact 67 mm body for better control
With a total length of 67 mm, the bit stays close to the drill, reducing runout and improving hole roundness. The short body is especially useful near backsplashes, corners, and tight mounting areas where longer core bits are hard to control.
• Optimized for construction hole cutting
From faucet and mixer holes in kitchen tops to penetrations for anchors and hardware, the bit provides a stable entry and guided feed. Installers spend less time correcting misaligned holes and more time finishing the job.
• Operator-safety focused design
The bit is compatible with wet cooling and designed for predictable cutting action. When used with water, heat and dust are significantly reduced, lowering the risk of overheating and improving day-to-day operator safety.
• Color & finish options for easy inventory
Available in black, red, or custom spray-painted finishes, these bits are easy to identify by size at a glance. The coating adds corrosion protection and keeps inventories looking clean and professional in your warehouse or on the service van.
Note: Wet drilling is strongly recommended on stone to improve edge quality and extend tool life.
Countertop cut-outs (granite and marble)
When drilling faucet and accessory holes in polished stone countertops, the compact 67 mm body keeps the drill stable and reduces wobble. Under light, controlled feed, the metal-bond segments grind efficiently and minimize chip-out around the hole, even close to edges and corners.
Porcelain and ceramic wall penetrations
Dense porcelain tiles can be unforgiving. By combining intermittent “pecking” (short in-and-out movements) with water cooling, the bit stays cool and the diamonds keep cutting freely. Color-coded finishes help installers quickly grab the correct diameter while working on ladders or scaffolding.
Workshop table drilling on drill presses
On drill presses or table drills, the short body and controlled RPM allow precise perpendicular entry. With continuous coolant supply, you can achieve repeatable hole diameters for hardware, fixtures, and anchors, reducing rework and improving fit-up tolerance in production environments.
1. Start at an angle to prevent skating
Mark the drilling point, then place the bit on the surface at roughly a 45° angle. Gently start the drill so the diamonds bite into the surface and create a shallow groove. This prevents the bit from wandering on polished stone or glazed tiles.
2. Bring the drill upright and continue with light feed
Once the groove is established, slowly lift the drill into a vertical position and continue drilling with steady, light pressure. Avoid forcing the bit; let the diamonds do the work.
3. Use wet cooling on stone
Whenever possible, use water to cool the bit and the workpiece. The water cools down the tool more effectively, so there is also a smaller risk of overheating-related hazards. Wet cooling helps carry away slurry, exposes fresh diamonds, and reduces chipping at the hole edge.
4. Use pecking on dense porcelain
On very hard porcelain, drill in short bursts, periodically pulling the bit out to allow water and slurry to clear. This “pecking” technique keeps the segments open, maintains cutting speed, and extends tool life.
• Speed and safety in one tool
The segment design supports fast drilling while keeping temperatures under control when used with water, helping contractors hit their schedule targets without compromising safety.
• Inventory clarity for multi-site teams
Color-coded black/red/custom finishes make it easy to pick the correct size quickly. The spray finish adds corrosion resistance, protecting stock in humid environments and during long storage periods.
• OEM-ready for large buyers
As a professional manufacturer and supplier of diamond tools, SENMINE can tailor diameters, colors, thread types, labeling, and packaging to your internal SOPs. This ensures consistent performance and presentation across different teams, branches, and regions.
• Can these bits run on a regular hand drill?
Yes. These diamond core bits are designed for use on both regular hand drills and table drills. For best results, keep the RPM moderate, avoid excessive pressure, and use water cooling on stone.
• What diameters are available as standard?
Standard diameters range from 6.5 mm up to 50 mm outer diameter, covering most common faucet, accessory, and anchor hole sizes. Larger or non-standard diameters can be produced under OEM orders.
• Which cooling method should I use on stone?
Wet drilling is strongly recommended for granite, marble, and porcelain. Water cooling manages heat, exposes fresh diamonds, improves edge quality, and reduces the risk of micro-cracks.
• How can I reduce entry chips on polished stone?
Apply masking tape over the drilling point, start at a slight angle to prevent skating, then bring the drill upright. Use a guide or template to control the position, keep the feed light, and use water to support a clean edge.
• Are these bits suitable for concrete as well?
They are optimized for stone and tile. For heavy concrete or reinforced concrete, we recommend using dedicated concrete core bits from SENMINE designed specifically for that application.
• Close-up: metal-bond diamond segment detail on a 20–35 mm bit.
• In-use: hand drill with water feed drilling a faucet hole in granite (show slurry evacuation).
• Color lineup: black/red/custom bits arranged by diameter for quick ID.
• Press setup: table drill fixture showing perpendicular entry and coolant management.
Specify the exact diameters and colors you need, and we'll build a set that matches your workflow. Speak with SENMINE—a trusted manufacturer and supplier of diamond tools for stone. Contact Us for a quote, lead times, or an OEM sample pack.
| Thread | Diameter/mm | Length/mm | Diameter/mm |
| M14 M10 1/2gas Hexagonal | Φ6.5 | 67mm | Φ25 |
| Φ8.5 | Φ26 | ||
| Φ10 | Φ30 | ||
| Φ12 | Φ33 | ||
| Φ14 | Φ37 | ||
| Φ16 | Φ40 | ||
| Φ19 | Φ50 | ||
| Φ20 | |||
| We also accept custom requests for different sizes. | |||
Tips: When using a hand electric drill, make a mark on the cutting material in 45 degree angle. Then you can drill holes in vertical.
