9mm x 12mm Box End Interchangeable Head 1/2"

Spring pinned retainer holds adapter in place on square drive interchangeable torque wrenches;Off-corner loading design on box end provides better grip and reduces fastener rounding;12 point box end for use on both 12 and 6 point fasteners;Laser etched and hard stamped size marking;Manufactured from alloy steel for better strength and longer tool life