External Hex, Internal Hex, Internal Torx
1/4 ", 4 mm, 15/16 ", 1/2 ", 1-1/4 "
1/2, 1, 2-1/2, 1-1/2, 3/8
Phosphated, Phosphatized, Gun-metal, Black Phosphate, Black Oxide
5 mm, 8 in, 28 mm, 1-3/4 in, 4-3/4 in
8-Point, 12-Point, External Torx, 7-Point, 6-Point
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