Feature:1. Using straight shank integrated design, come with high accuracy and good rigidity2. Automatically tighten keyless device, which can automatically increase the clamping force3. Key parts of drill chuck, come with special quenching to improve durability4. Adopt 40Cr material, possess 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 a milling machineHow to Use:Flat tail for drilling machine, back pull for milling machine, R8 for turret millingSpecification:Item Type: Integral Drill ChuckMaterial: 40CrHardness: 40HBAccuracy: 0.08mmApplicable Machine Tool: Milling machineClamping Range: Approx. 1 ~ 13mm / 0.04 ~ 0.51in Package List:1 x Integral Drill Chuck