External Hex, Internal Hex, Internal Torx
5/16 ", 5/8 ", 2-1/2 ", 4 mm, 1-3/8 "
3/4, 1-1/2, 1, 3/8, 2-1/2
Phosphated, Phosphatized, Gun-metal, Black Phosphate, Black Oxide
1-1/8 in, 3/4 in, 9/16 in, 13 mm, 2-7/16 in, 1-3/8 in
8-Point, External Torx, 12-Point, 7-Point, 6-Point
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