Designed to raise open bottom skids, boxes, and baskets. Two operations available: hand pump and DC power with rocker switch to raise or lower. Hand pump design features an ergonomic pump handle with two lifting speeds to accommodate for light or heavy loads. DC power units include one (1) 12V battery and on-board battery charger. Side stabilizers lock lift in place when load is raised above 20-1/2". Rolls smoothly on poly-on-steel wheels. Suffix "SS" stands for stainless steel units. Stainless steel units roll on nylon wheels.