Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, Metric, AF, SAE
9/32 ", 3/16 ", 5.5 mm, 16 mm, 25 mm
1, 1-1/2, 1/2, 2-1/2, 3/4
19.05, 9.53, 6.35, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide