Shop the DEWALT CCN & C6 Fasteners - Concrete Fasteners, 0.137" x 2-1/4". CCN Cordless Fasteners are a range of specialty fasteners for use in the Cordless Concrete Nailer (CCN) and Trak-It C6, for concrete, steel, and other specialty applications such as plywood or gypsum sheathing to steel studs, metal track to hard concrete, and attaching Stick-E accessories. ICC-ES ESR-4076.