This is a demonstration of how I have made the assembly of NSF, Trinity, Costco Commercial grade wire shelving racks a little bit easier. The assembly instructions in this vide will help you with most rolling wire shelving racks, not just the ones sold at Costco. This rolling storage rack is a fantastic storage solution; it is easy to assemble, easy to move around and easy to adjust shelf height. Rubber Mallet on Amazon: http://amzn.to/2oipmJJ