Overall Dimensions:Width: 24inDepth: 1/2inHeight: 18in APS1824 18in x 24in White Syncoat Magnetic Markerboard with Aluminum Frame It offers exceptional stain and wear resistance and since it's applied over steel the board permits the use of magnetic accessories.This markerboard features a full length APS Series 1 1/4in accessory tray with protective end caps.