Designed for some serious power, stabilization and precision control for those heavy-duty jobs. Switch on and off 1040 pounds of magnetic holding force by rotating the black knobs. The entire side plate is magnetized when turned on. One of the most compact, powerful and versatile welding tools in the market! FEATURES & BENEFITS Magnetic field turns completely on and off mechanically. Does not use an electrical power source. Switch off to wipe away metal shavings and the magnets stay clean. Mounts to flat and round surfaces of steel. Reinforced end caps for superior durability. Lightweight with incredible strength