A specialised drill bit designed to produce small-diameter holes in brittle surfaces, using a diamond cutting profile to abrade material rather than shear it. In use, the tool is mounted in a compatible drill via its hexagonal shank and run at appropriate speeds with light feed to progress the cut while minimising thermal and mechanical stress. The working section is intended to control how deep the tool engages the workpiece, helping operators achieve consistent results in glass, tiles and ceramics. Typical applications include installing fittings or routing small services where a neat round aperture is required and additional shaft length improves access in confined or recessed locations.