Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
5/16 ", 9/32 ", 7/16 ", 5/8 ", 11/16 "
1/4, 1-1/2, 1/2, 2-1/2, 3/8
38.1, 12.5, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide