Freeman PCTN64 14 Gauge 2-1/2 in. Heavy Duty Concrete"T" Nailer Drives 14-Gauge collated concrete "T" nails from 5/8"  2- " in length Ideal for furring strips, lathe to masonry, plywood to concrete, subflooring, steel banding 360-degree adjustable exhaust, reload indicator, dual spring magazine and trigger safety lock to prevent accidental firing Die cast aluminum body, anodized aluminum magazine and cylinder for durability Density of concrete varies according to age, newer concrete being more penetrable, therefore age may dictate the depth a nail will drive through the concrete