Internal Hex, Internal Torx, External Hex
5/16 ", 1-1/2 ", 20 mm, 5/8 ", 1-3/8 "
3/8, 1, 2-1/2, 1-1/2, 3/4
Phosphatized, Gun-metal, Phosphated, Black Phosphate, Black Oxide
3/8 in, 8 in, 16 mm, 5/8 in, 1-3/8 in
External Torx, 8-Point, 6-Point, 7-Point, 4-Point
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