The NR90AD(S1) framing nailer drives paper collated nails from 2" up to 3-1/2" in length and features Metabo HPT's next generation "industrial design." The redesigned head guard allows for faster and easier disassembly process, saving valuable time during tool maintenance ...The NR90AD(S1) framing nailer drives paper collated nails from 2" up to 3-1/2" in length and features Metabo HPT's next generation "industrial design." The redesigned head guard allows for faster and easier disassembly process, saving valuable time during tool maintenance. Weighing only 7 lbs, it is easy to use all day, while still providing the power of a bulkier, heavier nailer. It can be used for floor and framing, truss build-up, window build-up, sub flooring, roof decking, wall sheathing and housing construction.