HART’s (MM) 11pc 3/8” Deep Socket Set provide better reach and access to get to hard-to-reach fasteners. Chrome plated for maximum rust resistance, and 6 pt. socket design to prevent round-off. In addition, these sockets are forged from high-grade Chrome Vanadium Steel (CrV) to withstand the rigors of heavy-duty use and large size markings make finding the right size easier.. Standard set includes (11) 3/8” sockets: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm. Prevent Round-Off with 6 Point Socket Design Faster Size Selection with Large Size Markings Increased Durability with Chrome Vanadium Steel