Water Hard, Drill Rod, Material Steel, Fractional Size 15/32", Decimal Equivalent 0.4687", Dia. Tolerance /-.0005", Finish 15 RMS Max, Length 36", Length Tolerance .125"/-.000", Hardness Scale 241 BHN Max, Grade W1, Standards UNS T72301, SAE J437, ASTM A-686-92, FEDERAL QQT-580 REV CSpecification:Finish - 15 RMS Max Length - 36" Length Tolerance - +.125"/-.000" Hardness Scale - 241 BHN Max Grade - W1 Standards - UNS T72301, SAE J437, ASTM A-686-92, FEDERAL QQT-580 REV C WARNING::California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.