CR-MO alloy steel for long life;Lifetime warranty;Heavy duty blow molded storage case;8 Point design accommodates most railroad applications;SAE - inches: 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1, 1-1/16, 1-1/8

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