The SAE torque adapter set includes 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 1/2'' to 3/8" adapter and 1/4'' to 3/8" adapter.The torque adapter is made of fully polished 42 chromium molybdenum steel, hardness can reach HRC 45-48 for maximum strength and durability.
Material: chromium molybdenum steel