This Hitachi kit includes the NV65AH and EC89. The NV65AH Siding Nailer another very light nailer, the NV65AH is a well-engineered tool. It's packed with great features like a tool-less depth adjustment and a 360-degree exhaust diverter. It will feed either wire- or plastic-collated nails. It also ships with a non-marring tip. Our experience with Hitachi nailers leads us to believe that this is one of the most dependable tools we tested (Davis, Tool Test: Siding Nailers: Side Winders; Tools of the Trade Nov. /Dec. 2000: 42-51). The EC89 Twin Stack Compressor features an oil-lubricated cast iron pump and 13-Amp direct drive induction motor for longer life. Weighing just 57 lbs. the EC89 has an ergonomic carrying handle to make it easier to transport to any jobsite. A quick coupler is factory installed on the unit so it is ready to go out of the box.