Features Integrated Design: Straight shank integrated design ensures high accuracy and rigidity, providing reliable performance for your machining needs. Keyless Clamping: Features an automatic keyless tightening device, increasing clamping force effortlessly for practical and secure . Enhanced Durability: Key parts undergo special quenching treatment, improving durability and ensuring longevity for prolonged use. High-Strength Material: Constructed with excellent 40Cr material, delivering high tensile and yield strength, hardenability, fatigue strength, and toughness for reliable performance. Versatile Clamping Range: With a hardness of 40HB and a clamping range from 1-16mm, it is suitable for milling machines, offering versatility for various machining applications. Features: 1、Using straight shank integrated design, come with high accuracy and good rigidity 2、Automatically tighten keyless 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 toughness 5、The hardness 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 Hardness: 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