The GEARWRENCH Universal Socket with Adapter Set eliminates the hassle and pain of finding the right size socket for the job, thanks to its unique spring loaded pin head that automatically grabs fasteners 1/4-3/4 (7-19mm) in size. The GEARWRENCH Universal Socket works with screw eyes, hexagonal nuts, lag screws, hooks, bolt heads, etc. In addition, it comes with an 1/4" hex adapter that is easily connected to most drills.