General description For use in structural applications, TIMCO FirmaHold Collated Clipped Head Ring Shank Hot Dipped Galvanised 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 Ring Shank Material: Hot Dipped Galvanised Other information Rust protection complies with building regulations and meets service classes.