External Hex, Internal Torx, Internal Hex, TX, Hex
Imperial, Metric, Torx, AF, SAE
7/32 ", 9/32 ", 29 mm, 1-1/2 ", 11/16 "
1-1/2, 3/4, 2-1/2, 3/8, 1
6.35, 12.5, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide