Suitable for screw range of 4.0-6.0mm Hole diameter-7mm Applications include shelving & cabinets, suspended ceilings, switch boxes, trunking & cable trays, boilers, water heaters & radiators Unique design with expansion throughout the length of the plug Expands at the top giving instant grip Anti rotation features prevents spinning in the hole Suitable for concrete, brickwork, stone, blockwork, plasterboard, etc