Grip-Rite 16d Box - 3-1/2-Inch x .131 Vinyl Coated, Smooth Shank, 21? Full Round Head, Plastic Collated, Stick Framing Nails - 500 per tub 16d 'Box' - 3-1/2" x .131" - Vinyl Coated, 21 Full Round Head vinyl Coated, Smooth Shank, NON-Galvanized, Plastic Collated Strip Nails Clear, Resealable, Reusable, Stackable Plastic Tub. GREAT for Do-It-Yourself Projects Use with Grip-Rite GRTRH350 - 21 Full Round Head Framing Nailer 500 Nails per Tub