Features Integrated Design for Precision: The straight shank design ensures high accuracy and rigidity, enhancing the performance of your lathe and drill operations Automatic Tightening Mechanism: The innovative keyl device automatically increases clamping force, providing a secure grip for safe and efficient drilling Enhanced Durability: Key components undergo special quenching treatment, significantly improving durability to withstand rigorous tasks and extend tool life High-Quality Material: Constructed from excellent 40Cr steel, this drill chuck offers superior tensile and yield strength, ensuring reliable performance under heavy use Versatile Clamping Range: With a hardness of 40HB and a clamping range of 1-16mm, this tool is compatible with various milling machines, making it an essential hardware accessory Features: 1、Using straight shank integrated design, come with high accuracy and good rigidity 2、Automatically tighten keyl device, automatically increase the clamping force, very practical 3、Key parts of drill chuck is made after special quenching treatment to improve durability, useful and helpful 4、Excellent 40Cr material have high tensile strength, yield strength and hardenability, come with high fatigue strength and good toughn 5、The hardn is 40HB, clamping range from 1？16mm, and the applicable machine tool is a milling machine, very useful Specification: Item Type: Integral Drill Chuck Material: 40Cr Accuracy: 0.08mm Hardn: 40HB Clamping Range: Approx. 1 ~ 16mm / 0.04 ~ 0.63in Applicable Machine Tool: Drilling machine Package List: 1 x Integral Drill Chuck Package List 1 x Integral Drill Chuck