Features Integrated Design for Precision: Utilizing a straight shank integrated design, this drill chuck ensures high accuracy and excellent rigidity for your machining needs Enhanced Clamping Force: Featuring an automatic tightening device, the keyl drill chuck increases clamping force effortlessly, providing greater stability during operation Durable Construction: Key components undergo special quenching treatment, enhancing the durability and longevity of the drill chuck for reliable performance over time High-Strength Material: Crafted from 40Cr material, the drill chuck offers superior tensile and yield strength, ensuring it withstands demanding tasks without compromising quality Versatile Clamping Range: With a hardness of 40HB and a clamping range from 1mm, this lathe drill chuck is compatible with various milling machines, making it an essential tool for any workshop Features: 1、Using straight shank integrated design, come with high accuracy and good rigidity 2、Automatically tighten keyl device, which can automatically increase the clamping force, very practical 3、Key parts of drill chuck is made with special quenching treatment to 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 the applicable machine tool is a milling machine Specification: Item Type: Integral Drill Chuck Material: 40Cr Hardn: 40Hb Accuracy: 0.08mm Clamping Range: Approx. 1 ~ 1m / 0.04 ~ 0.51in Applicable Machine Tool: Drilling machine Purpose: Drill chuck Package List: 1 x Integral Drill Chuck Package List 1 x Integral Drill Chuck