It is a wide-headed steel screw. When the thickness of the insulation plate increases too much, it is necessary to use large-headed but plastic-coated PA body nails (dowels). Plastic anchor body diameter is 8 mm. The length of the dowel should be chosen so that the tip of the dowel enters 4 cm from the application surface on the full application surface. On the application surface with the dowel gap, the tip of the dowel should be chosen so that it enters 5 cm from the application surface. The dowel head should be 60 mm.