ITEM NAME:20Pcs 120 Grit Electroplated Diamond Grinding Burr Drill Rot Bits Best Tool N1Y6 description: 100% new high quality Color as shown Shank Diameter:3mm The Head Diameter:6mm Total Length:45mm Particle size:120 grit Uses: Diamond burr tools for grinding, engraving, cutting lines, polishing, carving, glass engraving Electroplated diamond grinding Various shapes and sizes Need to be used with electric mill/hanging mill/bench mill. Packing:1Set Electroplated Diamond Grinding Burr Drill Bits(20Pcs).Uses: Diamond burr tools for grinding, engraving, cutting lines, polishing, carving, glass engraving Electroplated diamond grinding. 100% new high quality. Color as shown.