Specifications Item Name: Drill Chuck Material: Metal Color: black + red Diameter: 43mm/1.7inch Length: 58mm/2.3inch Connection size: 1 / 2-20UNF Fixture range: 2-13mm/0.04-0.51in Feature: self-tighten, quick change Package Included: 1Pc Drill Chuck Features Premium MaterialDrill chuck is made of high quality metal material, which is durable, long service life and suitable for long working times. Ultra-durable construction meets the demands of frequent use. Strong & ReliableThe keyless chuck provides a big improvement in precision and holds these tiny bits far more securely and in better alignment with the rotation of the tool, under high-speed rotation, it not only maintains stability but also improves work efficiency. Quick ChangeThe drill chuck fits into power tools more easily and securely. Easily convert your cordless power screwdriver into a drill to quickly switch between different tasks reducing the amount of time needed for a project. Package ContentDiameter: 43mm/1.7inch, length: 58mm/2.3inch, connection size: 1 / 2-20UNF, fixture range: 2-13mm/0.04-0.51in. Please make sure of the size before purchase. Wide ApplicationA wide range of clamp sizes, from 2 mm to 13mm, drill chuck is suitable for a variety of drill bits. Make the most of your current rotary hammer. Much cheaper than buying a second rotary drill. Quick and easy change for different drilling jobs,saves carrying two drills about. Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 3.Please leaving a message before you give the bad feedback, if the products have some problems.Thanks for your understandings.