The Air Line Box is a practical and hassle-free solution for those looking to install a double trailer harness connector hole without drilling. Made of durable stainless steel and 14 gauge brackets, this product mounts securely to frame rails and fits most makes and models. It features light holes only (lights not included) and fits 4" lights with grommets. The Air Line Box comes with two 4" round load light holes, with bezels, "B" & "H", making it a versatile option for any trailer. Back plate not included, sold each.