External Hex, Internal Hex, Internal Torx, External Torx
2-1/2 ", 4 mm, 7/16 ", 5/16 ", 5/8 "
1-1/2, 1/4, 3/8, 3/4, 1/2
Phosphated, Phosphatized, Gun-metal, Black Phosphate, Black Oxide
1-11/16 in, 8 in, 13/16 in, 21 mm, 8 mm
4-Point, 8-Point, 6-Point, 12-Point, 7-Point
-