Electroplated carving points can be used on many materials such as glass, stone, hard wood, ceramic, shell and porcelain. To get the best life and usage out of your burrs use with a little water before or during use. Can be used in any rotary tool or flex shaft.Although last significantly less than sintered (metal bond) carving points. They are a great buy for beginners just starting to enter the carving field. This 10,20,30,50 piece shapes offers a large variety of cutting options. At very low costs. Shank Diameter: 3/32", 1/8" & 3.0mm; Total Length: 45mm. Can be installed on the electronic grinder, hanging mill and hand electric drill (not included here). Used for sculpturing, dressing, precision grinding and internal grinding carbide in ceramic, glass, precious stone, alloy and many ther abrasive materials.