60 GRIT: #60 Grit Diamond Rotary Grinding set, rougher which are quicker than the larger grit burrs when Sanding, Polishing and Engraving. MULTI-PURPOSE: Diamond Grinding Burr uses on stone, glass, metal, hardwood, tile, ceramics, marble, and other hard materials MULTI-FUNCTION: Diamond Drill bits have 10 different grinding bits for abrasive, engraving, cutting, polishing, carving and COMPATIBILITY: Universal 3mm (1/8 inch) shank grinding drill bits multitool and most rotary tools or die grinders size:3mm Material:Diamond colour:Silver Package Contents: 20 x Diamond Burr Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.