Diamond Glass and Tile Drill Bit GRAPHITE 8 mm cylindrical (57H279)

Diamond glass and tile drill bit GRAPHITE 8 mm cylindrical (57H279) is a specialist cutting tool designed for making precise holes in brittle materials such as glass, ceramic tiles and porcelain. The bit features a diamond‑impregnated tip that grinds rather than chips, delivering clean, chip‑free holes with minimal radial stress. Its cylindrical shank fits standard drill chucks and is intended for use with handheld drills or drill presses when appropriate operating speeds and cooling are observed.

Advantages

The diamond abrasive tip provides high hardness and wear resistance for longer service life when working with brittle surfaces. The cylindrical 8 mm diameter ensures consistent hole size and stable cutting action. Because the cutting action is abrasive rather than a conventional cutting tooth, the bit reduces cracking and chipping at the hole edge and yields smooth, accurate results. Compatibility with common drilling tools and straightforward mounting make it convenient for both professional installers and hobbyists.

Suitable for

• Drilling holes in glass panes and mirrors
• Cutting holes in ceramic and porcelain tiles for plumbing and fixture installation
• Creating openings for wall anchors and inserts in tiled surfaces
• Craft and DIY projects involving fragile, brittle materials

Key specifications

• Tip material: diamond abrasive for grinding brittle substrates
• Shape: cylindrical shank for standard chucks
• Diameter: 8 mm working diameter
• Intended materials: glass, ceramic tiles, porcelain and similar brittle materials
• Use type: wet or cooled drilling recommended to extend tool life

How to use

Secure the workpiece and mark the drilling position. Start drilling at low speed to establish a shallow guide groove; avoid applying excessive axial force. For glass and tile work use light, steady pressure and maintain a low to moderate rotational speed. Keep the drill bit and work area cooled using a steady flow of water or periodic lubrication to prevent overheating and premature wear. When the hole is complete, withdraw the bit slowly while the tool is still turning to avoid chipping at the exit side.

Usage recommendations

Use protective eyewear and secure the material before drilling. For best results on large or thick panels, support the piece on a soft backing and use continuous water cooling. Replace the bit when grinding efficiency declines to avoid increased force and possible damage to the workpiece.