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Hex Key Set, 25Pc Includes the most commonly used SAE and metric sizes:1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16 & 3/8 and 1.27, 1.5, 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 7, 8 & 10 mm. Heat treated carbon steel with black oxide finish...