Kobalt Metric 3/8-in Drive 6-point 21mm Shallow Socket

6-point design helps reduce risk of slippage and rounding your fastener. Constructed of chrome vanadium steel and heat treated for strength and durability. Professional grade, high polish finish. Size callouts are laser etched. Blue color stripe helps to quickly identify metric sockets. Meets or exceeds ASME specifications. Hassle-free lifetime guarantee.