Internal Hex, External Torx, External Hex, Hex, TX
AF, Torx, Imperial, SAE, Metric
9/32 ", 7/16 ", 7/8 ", 5.5 mm, 1-1/2 "
1/4, 1-1/2, 1/2, 2-1/2, 3/8
9.53, 6.35, 38.1, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide