TIMCO Firmahold Nail & Gas Ring Shank Firmagalv+ with 3 Fuel Cells are designed for using with gas framing nailers to join together large wood works including timber frames and fencing. The diamond point allows for maximum penetration with the clipped head to increase the number of nails per strip and reduce tool loading times. The Firmagalv+ coating makes them suitable for outdoor use. Comes with 3 Fuel cells.