Middle Atlantic Aluminum RLA19-1245B The Middle Atlantic Aluminum Open Frame Rack RLA19-1245B (Black) an open frame rack constructed from extruded aluminum with a weight capacity of up to 400 lb. Its 3/16 inches uprights are 12-24 threaded in the front and the rear and have thick top angles to provide extra stability for cable ladders. Its 1/4 inches aluminum base is 15 inches deep with mounting holes for the floor to ensure extra stability. Knock down construction lowers shipping costs and offers flexibility for future changes to your set up. Choose from a wide range of accessories to customize your rack to fit your needs, including a vertical cable manager. This rack is designed for 19 inches wide equipment.