Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
11/32 ", 5.5 mm, 5/16 ", 7/32 ", 9/32 "
1-1/2, 1/4, 2-1/2, 1/2, 3/8
6.35, 12.5, 25.4, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide