6 Inch Double Action Hinge - Zinc - Highly Rust Resistant Adjustable Double Acting Spring Hinge - 6 inches Zinc Plated Finish - Great for the Outdoors - Highly Rust Resistant For Door Thickness: 1 1/4" - 1 3/4" Also known as Saloon Door Hinges, Cafe Door Hinges, and Swinging Door Hinges Approved by the New York City Housing Authority (NYCHA) and patented in Taiwan, China and the USA.