Constructed from injection molded, engineered thermoplastic resin that will not chip, warp, crack, rust, or peel. Each model has two - 20 gauge steel cabinets that lock to secure your equipment. Includes a set of two keys. 3 outlet UL approved electrical assembly. Shelves have a 1/4" safety retaining lip and a raised texture surface to enhance product placement and ensure minimal sliding. Four 4" silent-roll, ball bearing casters, max. weight rated at 125 lbs. each.