Internal Hex, External Hex, Hex, TX, External Torx
Imperial, AF, Torx, Metric, SAE
9/32 ", 9/16 ", 3/16 ", 5/16 ", 11/16 "
1/4, 3/4, 2-1/2, 1/2, 3/8
6.35, 25.4, 38.1, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide