The Amerimax gutter and downspout system features a black baked-on factory finish paint and durable aluminum construction. Our gutter systems will help control roof runoff and help prevent erosion. The outside box miter is used to connect two pieces of gutter turning an outside corner of your roof line to allow free flow of the roof drainage to the downspout. It is connected to the gutter length with 2 Seamers connectors (not included). Sealant is required for installation (not included).