Tool Steel Flat Stock, Steel Material, Width 1 1/4 in, Thickness 1/2 in, Fractional Size 1/2 in x 1 1/4 in x 36 in, Finish Unfinished, Length 36 in, Length Tolerance +0.250 to +0.500 in, Hardness Scale 188 to 223 BHN; Rockwell B90 to 97, Grade S7, Standards ASTM-A681, FED-QQ-T-570, SAE-J-437