Black Alloy Steel - Made from heat treated 6150 alloy steel. Best for applications where extreme strength and hardness are required. Perfect for Class 12.9 cap screws!!

Min. Tensile Strength (MPa): 1200 !!

NOTE : For those ordering the 11 piece set, it includes the following Hex Keys:

.050" 1/16" 5/64" 3/32" 7/64" 1/8" 9/64" 5/32" 3/16" 1/4" 5/16"