Apex SF-18MM15 Standard Length Drive Socket, Metric, 18 mm 6 Point Socket, 1/2 in Female Square Drive

Surface Drive impact sockets have large openings on the six corners of the opening to create a floating action that allows the socket to slip quickly and easily onto the nut or bolt. Ideal for compensating for imperfect alignment between the tool and fastener. Not generally recommended for impact use. These sockets are identified with a SF- prefix. Apex® sockets have hex tolerances that are on average 48% tighter than DIN and 35% tighter than ANSI requirements. With Apex® you are assured of an exact, sure fit. All Apex® sockets have the tightest tolerances for straightness and concentricity in the industry. High strength fasteners in demanding situations, like those found in the automotive and aviation industries, often require the use of an impact wrench or impact driver to deliver the amount of torque required to tighten or loosen them.