The Forgefix Rimless Wall Plugs can be inserted to depths below the surface of the base material. Their sprung anti-spin fins provide a two-way lock, preventing spinning and loosening from overhead applications. Due to this precise two-way expansion, the plugs are suitable for close to edge applications. Made from 100% Nylon. APPLICATION:Ideal for both lightweight and medium-duty fixing applications.Ideal for fixing wall lights, shelving and cupboards.Often used for satellite dish installation.Suitable for most types of threaded screws including multi-purpose, general purpose, coach screws etc. Not suitable for Machine Screw threads.