This APEX SF-20MM38 SURFACE DRIVE SOCKET is a NEW 20mm, 1" Drive Deep Socket. Surface Drive Sockets locate the fastener more quickly than a
traditional six point broach. The broach is rounded in the corners which
compensates for any misalignment between the socket and the
fastener. Surface drive sockets are designated by SF. The rounded Surface Drive corners allows this type of socket to be less marring especially on chrome fasteners.
