Astro Pneumatic 1426FNP 1426 Astro Pneumatic 1/4” Heavy Duty Hand Riveter 5-3/4” Extension Nose Piece The Astro Pneumatic 1426FNP 1426 Astro Pneumatic 1/4” Heavy Duty Hand Riveter 5-3/4” Extension Nose Piece unit allows the nose piece of the 1426 1/4” Astro Pneumatic Heavy Duty Hand Riveter to be extended to 5-3/4”. Unit can be interchanged quickly and easily.