Air rigging system via compressed air as power source, moving your heavy duty equipment move steadily and protect your floor from damage. We have follow kids of air powered moving equipment via the capacity: 10 tons air bearing caster, 16 tons air rigging system, 20 tons air powered moving equipment, 32 tons air moving dolly, 48 tons air powered moving roller skate. If this kinds of capacity can not reach your requirement, just feel free contact with us. special production will be make for you. Shan Dong Finer Lifting Tools co.,LTD Email:sales@cargotrolley.com http://www.cargotrolley.com/