ALFRA TMA-660 Adjustable Angle Magnetic Welding Clamp uses a patented magnet technology (US Patent No. 8350663B1). This compact tool includes two TMA-600 clamps to offer up to 2 x 660 lbs (2 x 300 kg) of load-bearing capacity. TMA-600 is a must have for everyone who needs to weld heavy work pieces together at different angles.