Specifications: Material: Steel; End design: ball nose; Shank diameter: 3.175mm; Cutting edge diameter: 2mm or 2.5mm or 3.17mm (optional size); Cutting edge length: 22mm/0.67"; Total length: approx 39mm/1.53"; Quantity: 10pcs(same size). Features: - Non stick cutter, tasteless, quiet, blade design, sharp. - Clean, tidy, no burr. - Spiral chip design, chip smooth, reduce heat. - Applies to the relief process of sub GREE, PVC, density board, hard wood. Operation: 1. For the design of portable and desktop woodworking engraving machine, can not be used in drill machine. 2. Smooth surfaces, such as wood, to avoid the processing of copper, iron and other metal and sand, stone and other non wood materials. 3. Use appropriate size clip. 4. Tool clamping, found that the cutter has a beating phenomenon, should immediately stop, repeat clip a few times to get the tool shank and fixture to get full contact, and then work. 5. Cutter handle and the clamping sleeve contact should be good, a tool shank must be fully inserted into the jacket, tighten firmly. Package included: 10 pcs x Double edge milling cutter(same size)