Features: Tool-free accessory allows you to quickly and easily lock and release. Allows you to effortlessly hold round-shank drill bits from 0.8mm to 10mm (0.03-0.39") securely. For use with any 1/4-inch hex impact driver, snaps easily into the power screwdriver. Converts a cordless power screwdriver into a drill or grinder in seconds. It can NOT be used counterclockwise and NOT suitable for impact drivers or applications involving high torque load. Specifications: Material: Free-machining Steel Diameter: approx 40mm/1.57in Height: approx 50mm/1.96in Joint length: approx 50mm/1.96in , diameter: 6mm/0.24in Chuck Size Thread: 3/8"-24UNF Chuck-in Diameter Range: 0.8mm to 10mm With 1/4" Hex Chuck Adapter Suitable for 9.3mm axis Package Includes: 1x Drill Chuck note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.