Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, Torx, Metric, AF, SAE
7/32 ", 9/32 ", 3/16 ", 5/8 ", 11/16 "
1, 2-1/2, 1-1/2, 3/8, 1/2
25.4, 38.1, 19.05, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate