Tight grip easy to turn by hand,so that the output torque becomes larger. Works with any 1/2\-20 UNF mount. Fits Many Drill Models and Brands with 1/2\-20 UNF Thread. Classic key three-jaw design, quick Change and easy lock. Easily and securely to install a wide range of twist drills with 1-13mm shanks. Built with all-metal construction for maximum durability Compatible with impact drill and different power tool electric drill. Well perfect for drilling machines, suitable for centering, drilling, tapping, reaming operation. Specification: * Capacity: 1.5-13mm / 1/16-1/2 Inch * Thread Mount: 1/2-20 UNF * Shank Type: SDS Plus * Chuck Size(Approx): 5.9 x 4cm/2.3\ x 1.6\ (L*D) * SDS Plus Shank Size: 64 x 12.5 x 17mm/2.5\ x 0.5\ x 0.7\ (L*Thread Dia* Max.D) * Key Size: 8 x 4 x 1.7cm / 3.1\ x 1.6\ x 0.7\(L*W*H) * Material: Material: High speed steel Package Includes: 1 x Drill Chuck with SDS Plus Shank and Grip Chuck Key Notice: 1. Please allow a bit error due to manual measurement. please make sure you do not mind before you buying. 2. The color may have different as the difference display, pls understand.