Bihui Tools 20mm Diamond Milling Bit - Precision Milling for Clean Holes in Hard Materials

When you’ve drilled a starting hole and need to enlarge, refine or perfect the opening—especially in dense porcelain, tile, stone or glass—the BIHUI Tools 20 mm Diamond Milling Bit delivers the control and durability you need. Its 20 mm diameter is a common size for fixture penetrations, valve cut-outs, electrical box openings and more. The medium-grit diamond bond helps it cut efficiently while still producing a smoother, cleaner perimeter—minimizing chipping, reducing damage, and improving finish quality.

Because it fits standard tool arbors and works either wet or dry, you can integrate it with your workflow wherever you are—whether you’re in a dry interior finish job or a wet storefront panel install. Use it to clean up the edges of a drilled hole, open an existing size to match fixture dimensions, or refine openings in porcelain that resist standard bits. The result is precise, clean holes and installations that look as good as they perform.

Why Tile Pros Trust It

• Optimized diameter: 20 mm size matches many fixture and plumbing penetration needs

• Professional-grade diamond bond: Handles dense materials while maintaining finish quality

• Versatile fit: Compatible with standard grinder or drill threads—easy tool integration

• Dual mode usage: Can be used in wet or dry conditions depending on job requirements

• Reduced damage risk: Smooth milling action minimizes chipping and keeps high-finish surfaces intact