Heavy duty all-welded aluminum construction. These racks accommodate 18˝ x 26˝ (457 x 660mm) sheet pans. Side-to-side crossbracing. Slide spacing ranging from 2˝ to 5˝ (51 to 127mm). 5˝ (127mm) swivel casters with polymer tread. All models shipped assembled. all-welded pan rack #OUR-1830-2/W all-welded pan rack #OUR-1810-3/W