The keyless drill chuck suitable for cordless drill, electric screwdriver and some electric drill. It's high precision 1/2*20 spindle thread and tapered hole. Ergonomically designed with plastic sleeves that eliminate the possibility of rust. Model Number: CF-DC001Capacity: 2-13mmMount: 1/2-20 UNF, Thread Hole Diameter, 12.7mmDrill Chuck Total Length: 75mmNet: 240gPackage content: 1x keyless Drill ChuckIdeal for portable hand held drilling machines and works well for hammer drilling and screwdriver operations.