One of the best selling roofing nailers, the NV45AB2 is extremely lightweight, (only 5.5 Lb.) making it the essential tool for the fast-pace working environment. It features rapid driving and unprecedented quick response with unique cylinder valve firing mechanism allowing you to fire up to 3 nails per second. The NV45AB2 will fire all standard roofing nails ranging in size from 7/8 In. to 1-3/4 In.