... ensure the stability of frame rail and all the structure.e. Safety device: floor-call device, autimatic leveling device, overloading warming ... technology to ensure stable perfomance and stability. Specific details specificationsSC150/150(there also haveSC200/200, SC150, SC100/100 ,SC200,SC100or SCD ... cage and high quality paint make it long-lasting. , SC150/150 construction hoist