Features Straight Shank Integrated Design: Ensures high accuracy and excellent rigidity for reliable performance in various applications Automatic Tightening Mechanism: Features an innovative device that automatically increases clamping force, enhancing practicality and ease of use Enhanced Durability: Key components undergo special quenching treatment, significantly improving longevity and performance under heavy use High-Strength 40Cr Material: Offers exceptional tensile strength and fatigue resistance, making it ideal for demanding industrial tasks Wide Clamping Range: Capable of accommodating a clamping range from 1 to 13mm, perfect for use with milling machines and other industrial tools 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