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Carbyne Tools' 25 Piece Folding Hex Key & Star Wrench Set is constructed of heat treated S2 steel, has very durable manganese phosphate finish, and features precision chamfered ends for working ease. The heat treated S2 steel is stronger than chrome vanadium. The manganese phosphate finish is corrosion resistant and more durable than black oxide. Contents: Metric Sizes: 1.5, 2, 2.5, 3, 4, 5, 6, 8mm, Inch Sizes: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4” Star Sizes: T9, 10, 15, 20, 25, 27, 30, 40