The Cambro CPR21423151 is a premium shelving ledge designed for Camshelving® systems. Measuring 21"W x 42"L x 4-1/4"H, this kit includes one double level side rail and two double level end rails, along with the necessary side and end brackets for easy installation. Constructed from durable polypropylene in a soft gray color, it provides reliable support and organization for your shelving needs, enhancing both functionality and aesthetics in any storage space.