The Quantum Storage Systems BL48-4 wire back ledge is made of chrome-finished steel for strength, durability, and resistance to dirt buildup and corrosion, and is suitable for use with a 48" wide wire shelf (not included). The ledge is four inches high to help prevent items from falling off the back of the shelf. Its open wire design permits air circulation in the work environment and helps resist dust build-up. The ledge measures 4 x 48 x 1 inches (H x W x D). (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) No tools are required for installing this ledge on a wire shelf. It comes in a pack of four ledges.
Quantum Storage Systems manufactures storage bins and systems, and steel and wire shelving. The company is headquartered in Miami, FL.