The Metabo-HPT 21-Degree 3-1/2" Plastic Collated Full Round Head 36V Cordless Duplex Nailer (NR3675DD) is here to revolutionize the concrete forming jobsite as it allows for a massive productivity boost vs. hand driving Duplex nails. Save money on the jobsite by saving valuable time! Move quickly while building concrete forms and scaffolding with the industry's first, battery only, cordless Duplex nailer solution. Metabo HPT's unique Air Spring Drive System produces a similar feel to using a pneumatic nailer, combined with the power of the MultiVolt™ battery, this cordless Duplex nailer works all day long, driving up to 16D Duplex nails. Drive up to 900 16D 3-1/2" Duplex nails per charge with the included 2.5Ah MultiVolt battery. For bigger jobs, power up with a 4.0Ah MultiVolt battery and drive up to 1,200 Duplex nails on a single charge!