Features Uniform Nickel Plating: This CNC lathe collet chuck holder has uniform nickel plating to prevent rust and wear. Tight Runout: This practical CNC lathe collet chuck tool holder resists corrosion while maintaining tight runout. High Concentricity: Mill collet tool holder has Highly dynamic balancing system, high concentricity, high engraving accuracy, can improve engraving efficiency. Longer Accuracy Maintaining: Our CNC mill collet tool holder maintains longer accuracy during repeated use. 20CrMnTi: Mill chuck tool holder is made of 20CrMnTi with accurate processing and anti rust treatment for durability. Specification: Item Type: Mill Collet Tool Holder Material: 20CrMnTi Rotation Speed: 30000rpm Package List:1 x Mill Collet Tool Holder 1 x Storage Box Package List 1 x Mill Collet Tool Holder 1 x Storage Box