Hitachi 20163S 3-1/4-in X .131 Framing Nails, Full Round Head, Hot Dipped Galvanized, Plastic Strip Collation, For 21 Degree Framing Nailers, 1,000 Per Box The smooth shank nail provides excellent holding power in most wood applications Plastic collating not likely to cause splitting of wooden materials Hitachi 20163S 3-1/4-in X .131 Hot Dipped Galvanized Plastic Collated Nails