This aluminum flush nailer is a high qaulity 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 NR83 Full Head Framing Nailer, and SUPCO-SFN88. The Flush Drive is “C” shaped to ensure added protection for the operator of the nail gun. The “C” shaped design allows the nail to pass through the nail gun properly without the flush drive interfering.