Gator Cases GR-4L Rack Case. The Gator GR-4L is a 4 unit molded rack case. It features lightweight polyethylene construction, front and rear threaded 7mm zinc-plated steel rack rails, heavy-duty twist latches, comfortable recessed side handles and a 19.25 rackable depth.The item "Gator Cases GR-4L Rack Case" is in sale since Sunday, January 29, 2017. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Cases, Racks & Bags". The seller is "universalproaudio" and is located in Birmingham, Alabama. This item can be shipped to United States.