This is a new Lowes Project Source Commander plastic shelf riser spacer, designed to be compatible with specific shelving units to create additional storage levels. The item is offered with free shipping. As a plastic component, its primary value is in helping to organize shelves in garages, closets, or pantries by allowing you to create a tiered storage system within a single shelf space. It's a practical purchase for homeowners or renters looking to maximize existing shelving without a full replacement. Please note that specific dimensions, material composition, and exact compatibility details are not provided in the source information. For full product specifications and to confirm it fits your Commander shelving system, check the complete listing before purchasing. Lowes Project Source Commander Plastic Shelve Compatible Riser Spacer. Condition: New. Listed at 1.99 USD. Plastic Shelve Parts.