Made of high -quality Metal, with high hardness, abrasion resistance and rust resistance. Used for carving silver, jewelry, wood, walnut, olive core, beads, valuable soft metals, etc. The round cup sleeve includes 6 sizes: 010, 014, 016, 018, 020, 023 The specific 3/32 -inch (2.35 mm) handle is suitable for rotating tools, drills, grinders, suspension grinders, etc. Packaging content: 6 pieces of 3/32inch Handing jewelry to make round cups of burrs, Manufacturer: Jikoiuty