Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Torx, AF, SAE, Metric
9/16 ", 18 mm, 5/8 ", 11/16 ", 1-1/2 "
1/4, 1-1/2, 2-1/2, 3/8, 3/4
19.05, 25.4, 9.53, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide