Socket

Proto Tools is an American industrial hand tool company. Founded as Plomb, it is presently a division of Stanley Black & Decker. The company is credited with creating the first combination wrench in 1933. Male Square is Oriented In Line with Female Squares for Use with Fixes Head Torque Wrenches Full Chamfer At Drive Opening for Easy Engagement with Drive Tools Drive End Chamfer and Four Detents Help Provide Quick Positive Engagement with Drive Tool On Any of The Socket Drive Walls