Features High Accuracy Design: The straight shank integrated design ensures exceptional precision and rigidity for all your drilling tasks Effortless Clamping: Features an automatic tightening device that increases clamping force, enhancing efficiency and practicality during use Enhanced Durability: Key components undergo special quenching treatment, significantly improving longevity and performance under heavy use Superior Material Strength: Constructed from 40Cr material, offering high tensile strength and fatigue resistance for reliable performance in industrial applications Versatile Clamping Range: Hardened to 40HB with a clamping range of 1 to 13mm, making it suitable for various milling machines and lathe setups Features: 1、Straight shank integrated design come with high accuracy and good rigidity 2、Automatically tighten keyl device, support automatically increase the clamping force, very practical 3、Key parts of drill chuck come with special quenching treatment, which will improve durability 4、40Cr material, have high tensile strength, yield strength and hardenability, high fatigue strength and good toughn 5、The hardn is 40HB, clamping range from 1？1m, and applicable to milling machine Specification: Item Type: Integral Drill Chuck Material: 40Cr Accuracy: 0.08mm Hardn: 40HB Clamping Range: Approx. 1 ~ 1m / 0.04 ~ 0.51in Applicable Machine Tool: Milling machine Package List: 1 x Integral Drill Chuck Package List 1 x Integral Drill Chuck