For a trendy roof- and façade cladding system with horizontal lengthening effect without any visible nails or hooks, SVK introduces a new slate in blue-black: the new 30/60/5 (façade) and 30/60/9 (roof) with 3 pre-drilled holes for slating in double lap horizontal bond. The advantage of the pre-drilled holes is that the holes are drilled in the right position and that the roofer doesn't have to loose any time by drilling the holes himself.