Kobalt Standard (SAE) 3/8-in Drive Spline 1/2-in Shallow Socket

This spline socket fits both 1/2-in and 13mm fasteners. Spline socket design allows work on multiple fastener types including SAE, metric, 6-point, 12-point, spline, square, star and most rounded. Constructed of chrome vanadium steel and heat treated for strength and durability. Professional grade, high polish finish. Size callout is hard stamped. Meets or exceeds ASME specifications. Hassle-free lifetime guarantee.