There are many shapes such as sphere, cylinder, round head cylinder, needle, flat plate, etc..... fit dremel or other brand rotary tools.
150 Grits: diamond rotary grinding tools have 10 different grinding bits for abrasive, engraving, cutting, polishing, carving and etching, with 60 grits, have rougher surface which are quicker than the larger grit burrs when sanding, polishing and engraving
Suitable for use in grind the edge of glass, tile, marble, jewlery or rock. Come with the PVC box as shown on picture.Multi-functional: diamond grinding head burr are sturdy enough that can be applied on stone, glass, metal, hardwood, tile, ceramics, marble, granite and other hard materials
Shank : 3mm (close to 1/8").Fits most major rotary machines brands, use to grind glass, marble, rock or jeweler