Designed for horizontal laptop computer storage, two models each feature 3"H x 16"W x 12"D storage bays. 110-volt electrical outlets in each bay allow simultaneous charging of all your laptops through the cart's 12 power cord. Both styles include heavy-gauge steel construction, a silver-metallic finish, heavy-duty 5" locking rubber casters (two swivel) and doors with two-point locking systems. The 20-unit cart measures 45½"H x 25½"W x 29½"D; 30-unit cart is 38"H x 42½"W x 29½"D.