Hanger bolts are made from low carbon steel. Used extensively in furniture construction or repair. Wood screw thread is inserted into a pre-drilled hole in wood. Machine screw thread allows for attaching or clamping with use of nut. Hanger bolts are ideal for hanging materials from wooden structures, walls, or overhead. Bare finish fasteners have very low corrosion resistance. This is a good choice for indoor use or when protection from the elements is not an issue.