Used to attach residential 3x4 downspout (3x4 leader) to an exterior wall. Sturdy .027 guage aluminum.(4 pack) Aluminum alloy material, life than plastic products, more durable. The material is more environmentally friendly, in order to reduce plastic products and contribute to the global environment. Connect Gutter Downspout and give a pair of expansion screws as a gift. Easy to use, Just punch a hole in the fixed position, let the expansion screw insert first, and then fix downspout straps with screws. Color: Black Material: aluminium alloy Package Contents: 1 x set gutter downspout extensions(Accessories as shown in the figure-screw color random.'t accept the specified color.) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.