All sorts of diamond points great for craft, modelling, home, repairs etc. This master diamond bur set allows you to shape, grind and finish with precision. Great for filing glass, ceramics, tile, brick, plastics, wood, fiberglass, stone, rock carbide, gold, platinum, silver, metals or anything else that is hard. All shanks : 3.17mm 150grit Diamond Coated Complete in plastic storage case.