OAK Country Wide-Plank Oak plank in 3-layer construction with small bevel on long side and approx. 4 mm top layer, with approx. 4 mm backing in the same wood and middle layer conifer. Tongue and groove on all sides for easy installation. Cracks, knotholes and large knots are emphasized with black putty. Variations in colour and sapwood at the edges possible. Small open cracks and unsealed spots of a few millimetres are permitted.