Features Application: ER32 collet set is compatible with most hardware, hobby, household and other rotating tools, especially suitable for installation of drills, electric grinders, hanging grinders, etc. Premium Material: This collet holder and hook wrench are made of high-quality metal materials, which are corrosion-resistant and durable, high-strength, tough, and impact-resistant. Excellent Performance: This collet tool holder set has been heat treated and CNC machined, with stable performance, reliable use, and effectively extended service life. Ease of Use: The collet milling cutter tool is compact and easy to use, suitable for reinforcement of parts that need to be modified on the milling machine. Intimate Service: We provide 7-day worry-free return and exchange service for all customers. If you have any questions about our Hook Wrench and Collet Mill Tool Sets, you are welcome to contact us and we will be happy to help you. Specification: Condition: Brand New ER32 Clamping Range: 1-20mm Suitable For: R8 Machine Traction Line: 7/16 Accuracy: 0.01mm Hardness: 45-56 Chunk Length: Approx. 16cm / 6.3in Wrench Length: Approx. 20.5cm / 8.1in Chunk Outer Diameter: Approx. 4.8cm / 1.9in Chunk Inner Diameter: Approx. 2.7cm / 1.1in   Package List: 1 x Collet Chuck 1 x Wrench Package List