... heavy machining equipment such as 2500T and 800T free-forging oil presses, 2t electric hydraulic hammer, table model well type quenching & tempering ... rough cast of step shafts and round bars such as cold roller, corrugated roller and pipe die of mould-die, motor ... , drill collar, drilling stabilizer, elevator plug and joint used for oil drilling various types of ring, cake and base plate modules ...