Provides the leverage needed to loosen and tighten hex head fasteners without stripping the head. Contoured plastic T-handles are stamped with hex key size for instant identification. Chrome-vanadium steel shank. SAE 10-pc set includes sizes 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8". Metric 10-pc set includes sizes 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 8, 10mm.