1 Lb (about 50) 1.75-inch U-nails
Galvanized U-shaped nails with barbs for securing both polypropylene and metal mesh fencing to trees. 1 pound of U-nails (about 50) 1.75-inch U-nails. For 7-foot fencing use about 5 U-nails.
Rather that pounding the U-nail all the way in, leave some space so that the tree will have room to grow without damaging the fencing.