Internal Hex, External Hex, TX, Hex, External Torx
Imperial, AF, Metric, Torx, SAE
3/16 ", 8 mm, 9 mm, 25 mm, 1-1/2 "
1/4, 1-1/2, 2-1/2, 3/8, 3/4
25.4, 38.1, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide