NUT GRIP®,1/2” drive, Standard Length, Chrome Hand Sockets.    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: 1/2" Drive Shape: Square Length: 36mm Type: Nut Grip Socket 1/2 Sq. Dr. Nut Grip Metric Chrome Socket in 13mm