For the tightest floor possible choose the stainless steel T Headed Porta-Nail by PNI. Use when the application requires a non-corrosive nail or on ACQ treated materials ( ACQ approved). Porta-Nails are designed specifically for nailing tongue and groove wood floors using the Porta-Nailer and or Portamactic flooring installation tools. The patent Porta-Nail offers the following features: Wide head wedge shaped design with well defined barbs which prevent the nail from backing out. A cupped point which enables the nail to cut through the wood thus minimizing the potential for splitting. These design features provide for the greatest impact and holding power to ensure that your floor lasts a lifetime. One pack of 1000 Porta-Nails will nail approximately 200 square feet of tongue and groove flooring.