Features Precision Integrated Design: Features a straight shank integrated design for exceptional accuracy and rigidity, ensuring superior performance in all drilling tasks Automatic Clamping Mechanism: Equipped with an innovative tightening device that automatically increases clamping force, providing practicality and ease of use during operations Enhanced Durability: Constructed with key components that undergo special quenching treatment, significantly improving longevity and reliability for demanding applications High-Strength Material: Made from excellent 40Cr material, offering high tensile strength and yield strength, ensuring superior toughness and resistance to fatigue over time Versatile Clamping Range: Boasts a hardness of 40HB and a clamping range of 1-16mm, making it compatible with various milling machines for versatile hardware applications 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