2440A: SAE, ¼” drive, 6 Point Universal Joint, Standard Length, Chrome Hand Sockets.    A  six - point socket  is designed to contact the head of a fastener well away from the corners so contact is made on the thickest part of the fastener. the edges of a  socket  are angled back a few degrees to allow the  socket  to 1/4 Sq. Dr. Universal 6 Point SAE Socket in 5/16