USM grates are made from AR 400 abrasion resistant certified steel and are the longest wearing grates in the industry. We put our grates through three quality control inspections before they are shipped to insure the best possible product. USM utilizes CAD design structural webbing and increased radius in cut outs placed in strategic locations for greater durability. We have also added where possible, cradle support coverage for extra protection from excess wear. This process promotes optimum through-put and helps our grates to maintain maximum strength.