20mm CNC Diamond Incremental Finger Bit M12
20mm CNC Diamond Incremental Finger Bit M12 – For Granite, Marble & Natural Stone
Upgrade your stone shaping and enlarging work with this 20mm CNC Diamond Incremental Finger Bit (M12), designed for professional results on granite, marble, engineered stone, quartz, and other natural stone surfaces. This high-performance diamond bit is ideal for fabricators, tilers, stonemasons, and installers who need clean, accurate hole enlargement, edge shaping, and internal grinding.
Unlike standard drill bits, this finger bit is built specifically for controlled material removal. The incremental design allows you to gradually widen existing holes and openings without cracking or chipping the stone. Whether you are working on sink cut-outs, tap holes, benchtop openings, or custom stone shaping, this tool delivers smooth performance and consistent results.
Designed for Smooth Grinding & Hole Enlargement
This diamond finger bit is perfect for:
Enlarging pre-drilled holes
Grinding and shaping internal edges
Smoothing cut-outs in stone slabs
Refining holes for plumbing, tap fittings, or fixtures
CNC or manual use with compatible M12 tools
Thanks to its 20mm diameter, it offers excellent control while still removing material efficiently. It’s an ideal size for stone professionals who need a reliable tool for precision work.
Premium Diamond Coating for Long Life
The working surface is coated with high-quality industrial diamond, providing strong cutting power and long wear resistance. This helps the bit maintain performance even during repeated use on hard materials like granite and quartz.
The diamond surface ensures:
Faster grinding
Cleaner finish
Reduced vibration
Improved durability compared to standard abrasive bits
M12 Thread – Secure Fit & Easy Installation
This finger bit features a standard M12 thread, making it compatible with many common CNC adapters, stone grinders, and polishing tools. The secure threading helps reduce slipping and improves safety during operation.
Best Used Wet (Recommended)
For best performance and extended tool life, wet use is strongly recommended. Water cooling helps:
Reduce heat build-up
Minimize dust
Improve cutting efficiency
Prevent premature wear
Technical Specifications
Product Type: CNC Diamond Incremental Finger Bit
Diameter: 20mm
Thread: M12
Application: Hole enlargement, shaping, internal grinding
Suitable Materials: Granite, Marble, Quartz, Engineered Stone, Natural Stone
Use: Wet recommended (can be used dry with care)
Finish: Smooth grinding with reduced chipping
Why Choose This 20mm Diamond Finger Bit?
If you work with stone, accuracy matters. This tool is built to give you a clean finish, strong cutting performance, and reliable durability, making it a must-have for stone fabrication, installation, and workshop use.
