SET: 13 pc Stainless Steel Combination Wrench Inch Set: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, and 1.
17-4PH or 420 Stainless Steel (depends on lot)
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