This is the Gator GRR-4L. A part of their Standard Audio Racks Range. It is a Molded PE Rack Case; Front, Rear Rails; 4U; 19"" Deep; Locking, Pull Handle, Recessed Wheels. 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 Rugged pull-out handle.