These storm window snap fasteners are constructed of spring steel and they come in a zinc-plated finish. They feature a 3/8 inch offset and a 2-1/16 inch overall reach. This hardware is designed to secure both storm windows and screens that rest deeper than the door’s surface. Using these snug-fitting snap fasteners will help reduce rattling of loose window and screen panels. Each package includes 4 snap fastener panel clips. These clips are easy to install and they are used by many.