This is a business product. *The shape of the holder is molded to match the shape of the holder, so the shape will not change due to wear and tear. Compatible Materials: Tool steel, alloy steel, resin, rubber, general steel, stainless steel, aluminum, copper; Compatible devices: drill machine electric drill; MINIMO recommended hand pieces: Optimal M11, M21D, suitable for M21H, V21, M21, M21HD, Drum roll; Manufacturer model number: ES3002; Old product code: D6802