Ridgid R350RHE 3-1/2-Inch Round Head Framing Nailer Full strike drive system gives maximum power in a compact size 16% lighter and 22% more compact than before Rear-loading magazine with by-pass pusher for quick 2-step reloading Powerful motor is able to drive 3-1/2 in. long x 0.162 in. Dia. nails (16D common) Dry-fire lockout feature extends motor life and helps prevent empty drives