Internal Hex, Internal Torx, External Hex
2-1/2 ", 1 ", 4 mm, 9 mm, 1-5/16 "
3/4, 1-1/2, 2-1/2, 1/4, 1
Phosphated, Phosphatized, Gun-metal, Black Phosphate, Black Oxide
43 mm, 3/4 in, 9/16 in, 39 mm, 1-1/4 in, 1-3/8 in
12-Point, 8-Point, 7-Point, 6-Point, 4-Point
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