Kobalt Standard (SAE) 3/8-in Drive Spline 5/8-in Shallow Socket

This spline socket fits both 5/8-in and 16mm fasteners. 3/8-in drive. Spline sockets work on multiple types of fasteners including metric, SAE, 6-point, 8-point, 12-point, square, star and most rounded. Constructed of chrome vanadium steel for strength and durability. Size callout is hard stamped. Meets or exceeds ASME specifications. Hassle-free lifetime guarantee.