The fixing of window frames, door frames and squared timber without the use of plugs, makes these screws the first choice for installation. The work is right first time, so progress is quick and economic. The screws only require a 6mm diameter hole saving time and effort. The full thread means the screw will not pull the frame out of position on tightening. This ensures a stress-free and long-lasting fixing of the frame. The special thread reduces the amount of force required for screwing in the screws. When choosing a Frame Fixing Screw add the thickness of your frame to the maximum holding depth for the type of building material you are fixing to (see table).