eCo Permfix nail is specifically designed for use with eCo products such as truss hangers, hurricane clips, bracing strap, speed brace etc. The shaft of the nail is serrated as a standard ring shank nail and MII is forged on the head for easy identification. The nail is coated for corrosion resistance. The thickened collar ensures that the head does not break-off during application, which is often the case when using clout nails.