D4 Rolling Storage and Equipment Carts are constructed of D4 aluminum extrusion uprights, a welded tubular frame, top and bottom support beams, and a 1-1/4" thick laminated top cap with “T” mold edges and radiused corners. The casters are 4" dual wheel plate type, two locking, two non-locking, all swivel. Total weight capacity is 500 lbs evenly distributed on the shelves. The handle is ergonomically designed for safety. Three shelves included. ESD models include grounding cord and drag chain. Three heighths, three lengths, and three depths. Shelves adjust along cart uprights.