Used to attach residential 3x4 downspout (3x4 leader) to an exterior wall. Sturdy .027 guage aluminum. Aluminum alloy material, longer life than plastic products, more durable. The material is more environmentally friendly, in order to reduce plastic products and contribute to the global environment. Combined with expansion screws, the cassette can achieve the best stability effect and a higher safety factor. Easy to use, Just punch a hole in the fixed position, let the expansion screw insert first, and then fix downspout straps with screws