LLV windshield and mirror covers keep ice and snow from forming or sticking to windshield and mirrors, so Letter Carriers don't have to scrape or brush windows and mirrors clean. The postal windshield cover attaches by closing two metal hooks located on the end of the cover between the door and the door frame, and then pulling the cover over the window and hooking it onto the opposing door frame. These covers are an excellent option for LLVs that are parked outside overnight! Each cover is specifically designed for LLVs, constructed of durable Marine Vinyl and allows for an easy, one-person installation. Includes one postal vehicle windshield cover. Ships USPS.