Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Imperial, Torx, SAE, Metric
5 mm, 7/32 ", 13/16 ", 5/16 ", 9/16 "
1-1/2, 1/4, 3/8, 2-1/2, 1
19.05, 9.53, 6.35, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide