An L-bolt, also known as an angle bolt or mending plate bolt, is a type of fastener that consists of a vertical threaded shank with a right-angle bend at the top. This design allows the bolt to be used in situations where space is limited or where a 90-degree angle is required for mounting or repair purposes. They come in various materials, including steel, stainless steel, and aluminum, to suit different corrosion resistance and strength requirements.