Do it 6d x 2 In. 9 ga Hardened Steel Fluted Masonry Nails (490 Ct., 5 Lb.)

Thick, flat head, made of hardened steel and fluted shank to aid in driving and holding power. For attaching furring strips and floor plates to concrete. The 6 oz. box is PVC, hang-up package. 9-gauge, 0.148 diameter shank and 11/32" diameter head.