General description For use in structural applications, TIMCO FirmaHold Collated Clipped Head Plain Shank Firmagalv+ Nails & Fuel Cells are designed with high-quality paper collation to reduce nail jams. Technical specifications Dimensions: 3.1 x 90 mm Type: Clipped Head Plain Shank Material: Firmagalv+ Other information Rust protection complies with building regulations and meets service classes.