Durable Aluminum MaterialHigh quality weatherproof aluminum mesh. They won't rust or be damaged by sun and ice like plastic copies. Metal grilles used as leaf guards are durable and also weatherproof. They will protect gutters even in winter, snow, hail and high temperature. No Tools Required You don't need gutter professionals anymore. Get your gutter protection filters installed in seconds. The downspout guard universally fits the most common gutter sizes. Simply push the metal grates into position. We designed our gutter guards to stay in place all year round, so you don't have to constantly climb ladders to reposition them. Adjustable SizeNo need to worry. These 3 inch gutter guards can be easily bent and molded to fit your gutter system. This means a perfect fit and better filtering efficiency. The flexible gutter guard can fit most downspouts ranging from 2'' to 4'' (rectangular and circular gutter).