16 gauge all welded steel with durable gray powder coat finish. Top surface has 1/2" lip on three sides and center shelf is welded in place. Interior cabinet is 20-1/2"W x 20"D x 25"H. Cabinet door has a single point locking handle with 2 keys and full piano hinge on door prevents sagging. Sturdy tubular handle aids in mobility. 5" x 1-1/4" polyurethane casters; (2) swivel and (2) rigid. Unit ships fully assembled.