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

12-point socket 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. Size callouts are laser etched. Blue color stripe helps identify metric sockets. Meets or exceeds ASME specifications. Hassle-free lifetime guarantee.