Rawl bolts, also known as wedge anchors, are a type of fastener commonly used in construction and industrial applications to secure objects to concrete or masonry surfaces. They consist of a threaded bolt with a cone-shaped expansion nut. The bolt is inserted into a pre-drilled hole in the concrete or masonry surface, and the expansion nut is then tightened, causing the cone-shaped end to expand and grip the inside of the hole. This creates a secure and stable anchor point for attaching objects such as shelves, cabinets, and signage. Rawl bolts are available in a variety of sizes and materials, including zinc-plated steel, stainless steel, and galvanized steel, to suit different applications and environments.