Shelves are formed from 12 gauge steel with structural angle sub-frame and shelf reinforcements on shelves longer than 36 in. Shelves have 1-1/2 in. lips. Raised offset handle includes cross brace hand guard for added safety. These welded units are shipped set up and ready for immediate use. Mold-on rubber tires (8 in. x 2 in.) with 2 swivel and 2 rigid casters. Shelf clearance is 18 in. Includes floor lock to stop unwanted movement when loading or unloading. Top shelf height is 32 in.