The D55153FR, Heavy-Duty 3-1/2 In. (90mm) Round Head Framing Nailer/Compressor Combo Kit, contains a hand carry electric compressor that delivers 3.8 CFM at 100 PSI for speedy recovery and a round head framing nailer that is one of the lightest in the market. The framing nailer can be used for framing, sheathing, decking, and roof decking while the compressor also supports roofing and trim nailers. At a retail of $479 it is a $120 savings to you the customer.