Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
9/32 ", 4.5 mm, 9/16 ", 7/8 ", 11/16 "
1/2, 1-1/2, 1, 3/4, 2-1/2
19.05, 6.35, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide