Masonry nails – hardened nails used to fix objects to walls, ceilings and other surfaces. Their grooved shaft clings to the surface, preventing any loosening of the nail. These nails are good for medium duty applications when anchoring is not the preferred option. For use in concrete, block and wood, the masonry nail is a medium-duty fastener that provides a strong hold with ease of removal. There are three types of masonry nails: round, square and fluted each that are ideal for permanent and non-permanent fastening.