Comparison : Item # item-7635, Heavy Hex Nut, 1/4-20
Item # item-7637, Heavy Hex Nut, 5/16-18
Item # item-7638, Heavy Hex Nut, 3/8-16
Item # item-7639, Heavy Hex Nut, 7/16-14
Item # item-7640, Heavy Hex Nut, 1/2-13


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