This gutter hook is make of Aluminum Alloy, which have excellent durability and rusts resistance Our gutter hangers stable protections against rain, snow, and harsh weather, keep your 5inch gutter systems firmly in place Great for repairing sagging gutters and water backup and overflows, ensuring smooth water flows Designs for durability with a screw retention dimples for firm seating, slippage or stripping Its universals fit enables it to firmly fix the gutter to fascia panel of various size and materials, Manufacturer: LIzogli