Permanent magnet chuck (also known as permanent magnet hoist, permanent magnet jack) is divided into manual type permanent magnet jack and automatic permanent magnet jack, using contemporary high-performance Nd-fe-B magnetic material neodymium Iron-boron makes it smaller, lighter weight, stronger holding force, unique magnetic circuit design, and remanence is almost zero. The safety factor is high, and the maximum pull-off force is 2.8-4 times of the rated lifting capacity. The manual permanent magnet jack handle switch is equipped with a safety button, which can be operated with one hand, which is convenient and safe. "V" groove design on the lifting bottom surface.