• 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)
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