Excellent resistance to vibration and corrosion and ideal for unknown substrates and irregular or oversized holes. Rubber flange sets flush at surface to ensure a tight fixing. Made from synthetic rubber for use in more severe corrosion environments. Bonded brass insert. For use with lighting, shelves, trunking, cable trays, electrical fittings, brackets, grips, hooks and pictures. Suitable for use in solid brick and hollow brick, vertically-perforated clay, lightweight concrete block, hollow lightweight concrete block, aerated concrete block, plasterboard, chipboard, oriented strand board and PVC profile. Easy to install.