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Precisely Machined for Accurate Fit The ARES 5/16-inch Extra Long Hex Bit Socket provides all the extra reach you need for jobs in hard to reach places. Made of heat treated Chrome Vanadium with a precisely machined bit made with high strength S2 steel for an exact fit every time, this tool protects both the bit and fasteners from damaged edges while knurling gives you the extra grip you need! Features: Includes 1 pc. Extra long hex bit Size: 5/16-inch 3/8-inch drive Constructed of heat treated Chrome Vanadium High strength S2 steel bit CNC machined, chamfered bit fits precisely and smoothly into fasteners Knurling provides extra grip Also available as part of our SAE hex bit socket set