Feature: 1. Using high quality 40CR material and after quenching treatment, with high hardness and wear resistance. 2. The drill chuck clamping jaws are firmly clamped and locked to prevent slipping during use. 3. The tapered hole of the chuck is connected with the threaded hole, which is easy to disassemble and install, and not easy to fall off during use. 4. The drill chuck can clamp the drill bit with a diameter of 1-13mm, with high clamping force and high practicability. 5. This self-tightening chuck is mainly used for clamping drill bits and is often installed on small bench drills or electric hand drills. Specifications: Item Type: Drill Chuck Model: 1/32-1/2 JT33 Material: 40CR Applicable scene: small bench drill or hand drill Clamping drill diameter: approx. 1-13mm/0.04-0.5in Purpose: Drill bit clamping Package List: 1 x Drill Chuck