WALNUT, Shaker Slimline Kitchen Door for HOWDENSDescription Material Paint Drilled for HOWDENS. Featuring a 19mm walnut veneer panel, lipped with 25mm wide solid walnut, this door finishes at 22mm thick with a flat back and a 3mm deep front pocket. Solid walnut frame with veneered walnut panel. We would strongly suggest using magnet catches where possible on the doors to try and minimise the risk of bowing. Clear coat lacquered spray finished. 10% flat matt super durable finish as standard.