Oil Hard, Drill Rod, Steel Material, Fractional Size 5/64 In., Decimal Equivalent 0.0781 In., Dia. Tolerance +/-.0003 In., Length 36 In., Length Tolerance +.125 In./-.000 In., Hardness Scale 341 BHN Max, Grade O1, Standards UNS T31501, SAE J437, ASTM A-681-94, FEDERAL QQT-570 REV C Package of 10.