All 18" D x 24"W shelves have a 1/4" safety retaining lip and a raised texture surface. 3-outlet UL listed electrical assembly with a 15 ft. cord, cord management wrap, and three cable management clips. Electrical attachment is recessed to insure easy passage through doorways. Four 4" silent roll, full swivel ball, bearing casters, two with locks, max. weight rated at 125 Lbs. each. Three shelf models will hold 200 Lbs., of evenly distributed weight. Shelves and legs are made from recyclable material. Cabinets are made of 20 gauge steel. Includes lock with a set of two keys. Recessed chrome handle. Cable management access in back cabinet panel.