Why go to all this trouble when you can goto ANY hardware ( Home Depot, Ace, True Value ) I'll even ship you some if you cover the cost, and get 10", 12", or 16" Galvanized steel nails. I use my bench grinder to sharpen them and I hacksaw the heads off. I made 10 for about $2 and they stick perfect from 6-15-20 feet and they are very low maintance!!! Way better than an expensive drill bit or screwdriver!!