Smartsign S-9946-AL-10 Aluminum Sign,"Night Bell - Ring for Service" Down Arrow, 7" x 10" Heavy-duty, 40 mil thick, rust-proof aluminum. Made of 96% recycled materials Durable, plastic laminate protects against weather, abrasions, and chemicals 4 mounting holes for screws or nails. Rounded corners for longer life and simple installation For indoor or outdoor use