This commercial extra-shelf pack by Safco is the ideal shelving solution for any compatible shelving unit. Maybe you're building a brand new storage system; perhaps you need a little extra room in your existing setup. Either way, each shelf has a 500-pound weight capacity and can be adjusted in 1-inch increments for convenience. You won't even need tools to create your organizational masterpiece as these two black powder-coated-steel shelves attach to your frame via snap-together clips.