Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
9/32 ", 9/16 ", 18 mm, 5/16 ", 1-1/2 "
1, 1/4, 2-1/2, 1-1/2, 3/8
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide