The wings of the KT toggle expand by spring force when pushed into any cavity. These toggle fixings are suitable for use in plasterboard, fibre board, chipboard, hollow ceilings and other board. The spring loaded butterfly head ensures easy installation into cavities which makes it ideal for overhead applications such as ceilings. They come into their own when a previous fixing has failed leaving a slightly oversized hole. Simply push a fischer KT through and re-attach the fitting. The M5 x 50mm machine screw makes for a strong fixing ideal for pictures, lamps, small wall-mounted shelves, towel rails, lightweight cabinets and curtain rails etc.