Kobalt Metric 1/2-in Drive 12-point 21mm Deep Socket

12-point design allows work on multiple fastener types including 6-point, 12-point, square, star and some rounded. Constructed of chrome vanadium steel and heat treated for strength and durability. Professional grade, high polish finish. Socket size callouts are laser etched. Blue color stripe helps to identify metric sockets. Meets or exceeds ASME specifications. Hassle-free lifetime guarantee.