The Posse Box RD-31 Binder is a 3-Ring 4" binder made with protection in mind. Thick aluminum sheets enclose powerful clamps and rings to resist accidental opening. A hinged binding makes the RD-310 Binder easy to manipulate. The Posse Box 4" 3-Ring Binder RD-31, like all of our products, is made in the United States of America using locally procured materials. Made with durable Anodized Aluminum and designed by a former Sheriff and is made to endure the environments of most any profession.