Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, SAE, Metric
6 mm, 4.5 mm, 9/32 ", 3/16 ", 7/32 "
1, 2-1/2, 1-1/2, 1/2, 3/8
12.5, 6.35, 25.4, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide