The Fischer FID 90 insulation fixing plug set consists of 25 insulation plug screws that can be used in a wide variety of brickwork and masonry jobs around the house, garage and workshop. They are suitable for mounting lightweight components in plastered and un-plastered insulation panels made of polystyrene or polyurethane. The Fischer FID can be fixed either by hand, or with a electric screwdriver. The special spiral thread taps itself in the insulating board. Components such as letter boxes, lamps or motion detectors can be mounted using a 6 mm screw.