Deluxe Dovetailed Roll-out Trays For 21&rdquo Deep Cabinets Base 18 Roll-Out trays are 4&rdquo Deep and constructed with 5/8&rdquo Solid wood dovetailed sides and 3/16&rdquo plywood bottom. They include a notched front and full extension runners with integrated buffers. If you have any questions or want to order by phone please call 212-832-4200