... steel,SS,copper,brass 2)Weight from 0.05-20kg 3)Free Forging,Rigging Hardware,Hot Forging Free Forging,Rigging Hardware,Hot Forging 1) Material ... Quenching, Tempering ,Solution, Passivation.4) Production machine: Hot die forging presses,Friction press machine,Middle Frequency electric heater, Air hammer ... tools, scaffold couplers7) Manufacturer certification: ISO9001 (2000) / TS16949 Free Forging