External Hex, Internal Hex, Internal Torx, TX, Hex
Imperial, AF, Metric, Torx, SAE
7/32 ", 9/32 ", 7/8 ", 35 mm, 1-1/2 "
3/8, 1/4, 1-1/2, 1, 2-1/2
25.4, 6.35, 19.05, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide