Material diameter specification copper brass aluminium phosphorus bronze gun metal lead rod 5 mm and beyond 200 mm is bs astm wire 50 swg. To 4 swg. Grade copper 99. 99% rolled, Hot & cold, Electrolytic & commercial . Brass extruded & drawn naval brass, Free cutting, 60/40 brass, Forging brass. Phosphorus bronze pb2, 90/10 etc. . Gun metal 90/10, 70/30 etc. Lead 99. 95 to 99. 99% other grade is/bs/astm in form copper dow & pvc coated/ zinc & lead 99. 95 to 99. 99 brass 63/37, 70/30, Aluminum brass, Admiralty brass cut specifications and length guidelines