The first ever Z-Series® x NUT GRIP® Design. Nut Grip, 1/4” drive, Universals, Chrome Hand Socket Set.  NUT GRIP® is Ko-ken's special design for non-magnetic nuts/bolts to be held firmly in a 6-point socket. The design consists of two balls held in place by a spring steel ring. Input Drive Size: 1/4" Type: 5 piece Nut 1/4" Sq Dr. Z-series Universal NUT GRIP® Sockets - 5 pieces - RS2441MZ/5