Shelves are formed from 12 gauge steel with structural angle sub-frame and shelf reinforcements on shelves longer than 36 in. Shelves are lips down (flush edges). 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 19-1/2 in. Includes floor lock to stop unwanted movement when loading or unloading. Top shelf height is 32 in.