Comparison : Item # 38440, 1/4-20 NC H3 4FL NUT
Item # 38442, 5/16-18 NC H3 4FL NUT
Item # 38444, 3/8-16 NC H3 4FL NUT
Item # 38446, 7/16-14 NC H3 4FL NUT
Item # 38448, 1/2-13 NC H3 4FL NUT


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