Water-hardenable tool steel meets ASTM A686 and SAE J437 standards. Precision tolerances of diameter at +/- .0005" and length at +1/8"/-0. Suitable for tools, punches, pins, and machine parts. Tensile strength approximately 100-135,000 P.S.I. Features excellent finish, straightness, strength, and machinability. Identified by black or red ends.