Features Straight Shank Integrated Design: High accuracy and rigidity are ensured with the straight shank integrated design, providing and stable performance for your drilling needs. Automatic Keyless Tightening: The keyless device automatically increases clamping force, offering practical and efficient , saving time and effort during use. Special Quenching Treatment: Key parts of the drill chuck undergo special quenching treatment, enhancing durability and extending the product's lifespan for long-term use. High-Quality 40Cr Material: Utilizing 40Cr material with high tensile strength, yield strength, and hardenability, plus high fatigue strength and good toughness, ensuring reliability and durability. Versatile Clamping Range: With a clamping range from 1-1m and 40HB hardness, this drill chuck is suitable for a milling machine, providing versatility and adaptability for various projects. Features: 1、Using straight shank integrated design, come with high accuracy and good rigidity 2、Automatically tighten keyless 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 toughness 5、The hardness is 40HB, clamping range from 1？1m, and the applicable machine tool is a milling machine Specification: Item Type: Integral Drill Chuck Material: 40Cr Hardness: 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