CNC Diamond Finger Bit for Internal Cutouts & Hole Milling

Name: CNC Diamond Finger Bit for Internal Cutouts & Hole Milling
Brand: DINOSAW
SKU: φ10/12/16/20/25/30/35mm
Availability: InStock

φ10/12/16/20/25/30/35mm

DINOSAW diamond finger bit is a CNC milling tool for internal cutouts on stone countertops and slabs. It mills sink openings, enlarges faucet/drain holes, and forms inside corner radii in granite, quartz (engineered stone), and marble. Center water-feed cooling plus matched diamond grit and bond options keep the bit cutting smoothly while limiting chipping and heat marks. Sizes Ø10–35 mm with 15–100 mm working height help shops improve fit-up, speed up finishing, and reduce rework.

Compatible Materials & Products

Clean internal cutouts, holes, and inner radii on CNC

Specs and options

Specifications customizable upon request.

Type	Diameter (mm)	Working Height (mm)	Joint
Finger Bit	10 / 12 / 16 / 20 / 25 / 30 / 35	15 ~ 100	1/2" GAS (Male), 5/8"-11 (Female), M14 (Female), etc.

The DINOSAW diamond finger bit is a CNC internal-milling tool: it plunge- and side-mills sink cutouts, enclosed openings and programmed inside radii in stone countertops — where core bits drill round holes and blades cut straight, the finger bit completes the internal contour.

Real Milling Performance & Key Metrics

Seven Diameter Options

Seven diameters from Φ10 to Φ35 mm cover the internal milling spectrum: larger diameters rough fast at generous radii, smaller diameters reach tight corners.

Working Height

Working heights from 15 to 100 mm cover thin counter slabs through thick profiled edges in a single pass sequence.

Through-Spindle Cooling

Water feeds through the bit center to the cutting face: at the bottom of a deep cutout, external spray cannot reliably reach — center delivery is what cools the actual working zone.

Finger Geometry for Internal Milling

Finger-bit geometry lets the CNC plunge and side-mill inside a closed countertop outline: internal curves and enclosed cutouts are milled directly, where a circular blade alone cannot complete the geometry — the finger bit finishes what the blade starts.

Center Water Delivery

Water reaches the bottom cutting zone through the bit center, where external spray cannot reliably reach during deep milling: center delivery cools the actual cutting face, evacuates slurry from the kerf, and extends bit life at the depth where the work is hardest.

Inside Radius Milling

Inside corner radii are milled to the programmed radius directly: the cutout finishes at the CAD geometry without the corner cleanup that blade-only rectangular cutting leaves behind — cutout quality becomes a machined feature.

FAQs

Common Questions About Diamond Finger Bits

Global Leader in CNC Machinery & Diamond Tools Manufacturing

Real Milling Performance & Key Metrics

CE Certification

100+ Tech Patents

ISO 9001:2015

DINOSAW goes beyond merely complying with international engineering standards—we actively lead their formulation. As the principal drafter of key industry benchmarks for Stone Multi-Wire Saw Machines, CNC Wire Saw Machines, and Bridge Saws, we define the rules of precision manufacturing. Backed by ISO 9001, CE certification, and 100+ technology patents, our products guarantee exceptional durability and safety in the most demanding high-load environments.

Proven Expertise & Global Applications

75+

Countries Served Worldwide

20+

Industry machinery expertise

Trusted by clients in over 75 countries, DINOSAW delivers lifecycle quality traceability and specialized technical support across 20+ machinery sectors. From traditional mining and stone processing to high-precision manufacturing (semiconductors, quartz glass) and specialized fields like nuclear decommissioning, our comprehensive solutions consistently meet the world's most rigorous operational requirements.

Complete Production Solutions & Equipments

Choose equipment combinations for your product needs to establish efficient automated production lines and maximize profitability.

Pre-drill faucet/soap holes, then finish size and roundness with a finger bit. Match grit/bond to material hardness to reduce breakout and speed up assembly.

After milling inner curves with a finger bit, switch to a drum wheel to blend, radius, and polish cutout edges. Great for moving from shaping to finishing with fewer tool changes.

Run finger bits on a CNC engraving/router platform for accurate internal milling, relief work, and detailed cutouts. Standardize spindle interface and tooling to keep quality consistent across shifts.

Factory Direct Sales & Competitive Pricing

Buy directly from our factory to eliminate middleman markups. We provide processing plants with heavy-duty machines at factory-direct prices, helping you lower equipment costs and shorten your payback period.

We offer profitable wholesale programs for global distributors. For specialized applications, our engineering team provides OEM/ODM customization—adjusting machine dimensions, motor power, and CNC parameters to fit your exact material workflow.