Simpson Fence Bracket · 2x4 · Zmax® This bracket is for connecting 2x4 fence rails to fence posts. It is light and easy to use. Allows for quick connections and easier planning and building of fences. Use it to build fences, porches, patios and louvers. Made with 20 gauge galvanized Z-Max steel for strength and durability. Holes are sized for 8d nails or #6 wood screws into the supporting member and rail.