Feature:1. Adopt straight shank integrated design, which guarantee high accuracy and good rigidity2. Automatically tighten keyless device can automatically increase the clamping force3. Key parts of drill chuck come with special quenching treatment, therefore improving durability4. 40Cr material come with high tensile strength, yield strength and hardenability, high fatigue strength and good toughness5. The hardness is 40HB, clamping range from 1‑13mm, and the applicable machine tool is millng machineSpecification:Item Type: Integral Drill ChuckMaterial: 40CrAccuracy: 0.08mmHardness: 40HBClamping Range: Approx. 1 ~ 13mm / 0.04 ~ 0.51inApplicable Machine Tool: Milling machineHow to Use: Straight shank integrated drill chuck is mainly used for milling machines Package List:1 x Integral Drill Chuck