Diamond rotary grinding set, rougher surface which is faster than coarse grit wheels when sanding, polishing and engraving. MULTI-PURPOSE: The diamond grinding head burr is used on stone, glass, metal, hardwood, tile, ceramic, marble, granite and other hard materials MULTI-FUNCTION: Diamond drill bits have 10 different grinding bits for abrasive, engraving, cutting, polishing, carving and engraving COMPATIBILITY: Universal 3mm (1/8inch) shank grinding drill bits suitable for G4007, 1338,G4115 dremel multitool and most rotary tools or die grinders Tool - Rotary Tool Accessories - Grinding Tool - Set 20 diamond burs for DIY creations and craft projects The set of diamond bits. Different shapes: such as sphere, cone, cylinder, round head cylinder, ball, flat plate, etc. Compatibility Universal: 3mm diamond rotary bits suitable for most rotary tools and mini grinder and mini drill. Great gift for DIY enthusiasts: High work efficiency, perfect grinding effect. Convenient to engrave, easy to use, safe and reliable. NOTE: Please add water to cool when using diamond drill bit. Specification: Material: Steel shank and diamond head Grit: 150 Shank Diameter: Approx. 3mm Shank Length: Approx. 32.9-40mm Total length: approx. 43 mm Contents: 20 Diamond ground burrs