This aluminum flush nailer is a high quality adjustable flush nailer. It can be attached to the nose of the nailer either by set screws (includes allen wrench) or Thumb wing nuts. Compatible with: Hitachi NR83A 3-1/4 inch Full Head Nailer, Hitachi NR83A2 Full Head Framing Nailer, Hitachi NR83A2(S) Framing Nailer, Porter Cable FR350A Round Head Framing Nailer