Concrete Steel Nails Features: 1) Diameter (mm): 1.2 - 4.5 2) Length (mm): 20 - 100 3) Shape: steel wire, flat counte Concrete Steel NailsFeatures: 1) Diameter (mm): 1.2 - 4.52) Length (mm): 20 - 1003) Shape: steel wire, flat countersunk head, diamond or needle point, flutes or smooth shank4) Available: bright, C.C., V.C., E.G., H.D.G. and P.C. finish