Pittsburgh Lock Forming Machine is the most popular machine in traditional duct manufacture. Customer can change the rollers at their own will to form different lock. It has rigid and durable structure, which is no need of special maintenance. It adopts heavy duty underpan, arc welding frame, high precision bearing, COPRA designed rollers, thermal refined and grinded roll shafts. Its reliable transmission system is free of maintenance. The surface panels have been spray paint finished.