• CR-MO alloy steel for long life • Heavy duty blow molded storage case • Set includes: • 5/16″ (310) • 3/8″ (312) • 7/16″ (314) • 1/2″ (316) • 9/16″ (318) • 5/8″ (320) • 11/16″ (322) • 3/4″ (324) • 13/16″ (326) • 7/8″ (328) • 15/16″ (330) • 1″ (332)








