Malco - This versatile, compact, multi-socket nut driver is a handy tool for pocket or pouch. It is designed for the trade professional and offers superior performance, ease of use and long service life . Telescoping driver shafts provide two hex sockets at each end of the handle for a total of four hex sizes, 1/4", 5/16", 3/8", and 7/16". The driver shafts can be extended or retracted to produce three different end to end combinations: 1/4" and 5/16"; 3/8" and 5/16"; and 1/4" and 7/16". A quick-release, positive lock secures telescoping shafts in position and prevents collapsing when forceful in-line pressure is applied during use. Hardened Chrome Vanadium Steel Sockets offer sure fastener engagement and control. The comfortable 3-lobe handle is made of high-torque ABS plastic, and a non-slip TPR over-molded grip offers additional comfort and control on the job.