No tools, screws, nails or clamps are EVER required to install any Rockit Brand Bracket. Whether its to hang wild bird feeders, hanging baskets, elevated dog bowls, potted plants, shelving next to the grill, or a 70 lb planter box, a Rockit Brand Bracket is all you will ever need. Rockit Brand Brackets will attach to wrought iron, aluminum, steel, wood, composite, or vinyl pickets and adjust from 1/2" to a standard 2X2 picket. This ensures a perfect fit every time.