Price For: Each Standards: UNS T31501, SAE J437, ASTM A-681-94, FEDERAL QQT-570 REV C Length: 36" Material: Steel Item: Oil Hard, Drill Rod Length Tolerance: +.125"/-.000" Grade: O1 Fractional Size: 1/2" Hardness Scale: 241 BHN mx. Dia. Tolerance: +/-.001" Finish: 20 RMS Max Decimal Equivalent: 0.5000" Country of Origin (subject to change): United States