External Hex, Internal Hex, Internal Torx
2-1/2 ", 4 mm, 7/16 ", 5.5 mm, 1-3/8 "
1-1/2, 1, 3/8, 2-1/2, 1/4
Phosphated, Phosphatized, Gun-metal, Black Phosphate, Black Oxide
1-15/16 in, 3/4 in, 9/16 in, 1-11/16 in, 8 in, 39 mm
6-Point, 7-Point, 12-Point, 4-Point, External Torx
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