The all new fuel injected Trak-It C5 cordless concrete pin nailer is the lightest and smallest tool in its class, resulting in less operator fatigue and a better overall ergonomic feel. C5 has the greatest power output at 105 Joules, which allows for shooting into even the hardest concrete, able to shoot pins up to 1-1/2" in length, and is the only tool in its class that shoots .102, .108, .120 and .145 diameter pins. No other tool can make this claim! Size - Lower profile is achieved by a new patented combustion chamber design