These ForgeFix Plastic Expansion Wall Plugs are an extremely popular all-purpose lightweight fixing They are colour coded for size The anti-rotation moulding at the head of the plug improves the holding power when inserted It provides a cost-effective solution for lightweight fixing applications When a screw is inserted the screwing action wedges the plug firmly in place the soft material conforming tightly to the wall The wall plugs are suitable for most types of threaded screws including multipurpose general-purpose coach screws etc Not suitable for Machine Screw threads