Feature: 1. This self-tightening chuck is mainly used for clamping drill bits, and is often installed on small bench drills or electric hand drills. 2. Using high‑quality 40CR material, and after quenching treatment, with high hardness and wear resistance. 3. Chuck has self‑tightening function, and the clamping force is large, which is convenient for locking and prevents the bit from slipping. 4. The taper hole of the chuck is connected with the thread hole, which is easy to disassemble and install, and it is not easy to fall off during use. 5. The diameter range of clamping drill bit is 1‑16mm, which is suitable for all kinds of drill bit and has strong practicability. Specification: Item Type: Self-Tightening Drill Chuck Model: 1/32-5/8 JT3 Material: 40CR Applicable Scene: Small bench drill or hand drill Clamping Drill Diameter: Approx. 1-16mm / 0.04-0.63in Purpose: Clamping the drill bit. Package List: 1 x Self-Tightening Drill Chuck