Yamoto: 5/16" A/F Socket 3/8" Square Drive Bi-Hexagon Sockets 12 point side drive design gives a higher torque than normal sockets, grip worn nuts and will not round off existing nuts. All have a ball-retaining groove on each face of the square drive, which ensures a positive fit with accessories. Require only a one-twelfth turn to engage the next point of the socket. MPN: 5036140213319 EAN: 5036140213319 5/16" A/F Socket 3/8" Square Drive Attributes: Bit Type: Bi-Hex Drive Size: 3/8in Drive Type: Square Finish/Coating: Mirror Finish Chrome Plated Material: Chrome Vanadium Steel Number of Points: 12 Overall Length: 27mm Size System: Imperial Socket Depth: Standard Socket Size: 5/16in Socket Type: Bi-Hexagon Socket