MOBILE Giant back savers lift heavy loads in the office, factory or warehouse. Lifts higher for easier shelf stocking. Foot pump hydraulically raises platform. Overload valve protects pump and operator. Polyurethane casters: 2 swivel with brake, 2 rigid. Easy-release lever to lower.ULINE offers over 41,000 boxes, plastic poly bags, mailing tubes, warehouse supplies and bubble wrap for your storage, packaging, or shipping supplies.