Features 1、The integral drill chuck is designed with straight shank, possessing high accuracy and good rigidity. 2、Users can automatically tighten the keyless device and automatically increase the clamping force. 3、The integral drill chuck is the key part with special quenching treatment to improve durability. 4、The accuracy of the product is about 0.08mm, the hardness 40HB and the clamping range about 1-6mm. 5、Made of high‑quality material, the drill chuck is durable with long service life. Specification Item Type: Integral Drill Chuck Material: 40Cr Accuracy: 0.08mm Hardness: 40HB Clamping Range: Approx. 1-6mm / 0.04-0.24in Applicable Machine Tool: Milling Machine R8 Integrated Drill Chuck Is Mainly Used For Turret Milling Machines Package List 1 x Integral Drill Chuck