Our factory:Shan Dong Finer lifting tools Co.,Ltd produce all kinds of permanent magnet lifter professionally. Our permanent magnetic lifter have follow type:manual normal permanent magnetic lifter,automatic permanent magnet lifter,portable magnetic lifter. Automatic Permanent magnetic lifter from 1 ton to 20 tons with 3.5 times factor or 4 times factor. It's working life is more than 10 years with no worse. Manual permanent magnetic lifter tools is smaller than the automatic one. Capacity from 100 kg to 10 tons. It's safety factor is 3.5 times to 4 times too. Can used for one set,or used for three or more sets depend on the goods which you wanted to lift. Portable permanent magnetic lifter capacity is 30 kg, can hold by one hand,easily to moving and lift less than 30 kg workpiece. www.cargotrolley.com