Made of ground and lapped chrome steel. 25 pairs, hardened to 58-63 RC Certified Grade 24 accuracy. In a fitted case. Pair sizes are: 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 1/2", 17/32", 9/16", 19/32", 5/8", 21/32", 3/4", 13/16", 7/8", 15/16", and 1".
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