This is the Gator GR-4L. A part of their Standard Audio Racks Range. It is a Molded PE Rack Case; Front, Rear Rails; 4U; 19"" Deep; Locking. Lightweight Polyethylene Construction with Threaded, Field Replaceable 7mm Zinc-Plated Steel Rack Rails. Features include - Front & Rear Rack Rails, Heavy-duty twist latches, Comfortable recessed side handles, and 19.25"" rackable depth.