Oak Maas panel 2400 x 520 x 21 mm 3000 x 520 x 21 mm Oak Moldau Fineline panel 2400 x 520 x 21 mm 3000 x 520 x 21 mm Walnut Havel panel 2400 x 520 x 21 mm 3000 x 520 x 21 mm Walnut Havel panel 2400 x 520 x 21 mm 3000 x 520 x 21 mm