The fischer window frame screw is a special screw (with a length of up to 302 mm) for the cost-effective installation of window frames without plugs. The flat head and cylinder head designs are suitable for all commonly used window frame materials. The ift Rosenheim Testing Institute confirms their special suitability for the fixing of plastic widows into brick masonry. The screw is turned directly into solid and hollow building materials after drilling. The high-deep thread on the screw tip and the milled ribbing reduce the screw-in torque and enable an energy-saving installation. The continuous special thread prevents the window frame from being pulled against the substrate. This means that the frame is secured to the building material without tensile force or stress.