German manufactured high performance multi material screw with serrated teeth. Can be used in timber, aluminium, PVCu, aerated block & upto 2mm steel. No pre drilling required in most materials. Bangkirai, Chipboard, Oak, Aluminium, Plywood, Solid Wood, MDF, Plastic, Masonry, Concrete & 2mm Sheet Metal Heco Schrauben Website THE BEST QUALITY SCREWS YOU CAN BUY