Power extensions to convert power drill to drive 1/4"D, 3/8"D & 1/2"D sockets. Ideal for cordless drills and bit drivers.Provide greater access for hard to reach fasteners.Quick chuck fixing for ease and speed of use.1/4"D, 3/8"D extension length: 65mm; 1/2"D extension length: 72mm.Set of 3 extension set with wobble function available, please see Laser Part No. 8149.