Features Integrated Design for High Accuracy: Straight shank integrated design ensures high accuracy and excellent rigidity, providing drilling results for your industrial projects. Automatic Keyless Tightening: The keyless device automatically tightens, increasing clamping force for practical and efficient , saving time and effort during tool changes. Enhanced Durability with Special Quenching Treatment: Key parts of the drill chuck undergo special quenching treatment, significantly improving durability and extending the product's lifespan. High-Strength 40Cr Material: Constructed from 40Cr material with high tensile strength, yield strength, and hardenability, ensuring high fatigue strength and good toughness for reliable performance in industrial settings. Versatile Clamping Range: With a hardness of 40HB and a clamping range from 1 to 1m, this drill chuck is applicable to milling machines, providing versatility for your industrial tool needs. Features: 1、Straight shank integrated design come with high accuracy and good rigidity 2、Automatically tighten keyless 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 toughness 5、The hardness is 40HB, clamping range from 1？1m, and applicable to milling machine Specification: Item Type: Integral Drill Chuck Material: 40Cr Accuracy: 0.08mm Hardness: 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