General description For use in structural applications, TIMCO FirmaHold Collated Clipped Head Ring Shank Firmagalv Nails & Fuel Cells are designed with high-quality paper collation to reduce nail jams. These nails offer rust protection to comply with building regulations and meet service classes. Technical specifications Dimensions: 3.1 x 75 mm Type: Clipped Head Ring Shank Material: Firmagalv (galvanized for rust protection)