Darby style Model 1599 heavy weight adjustable nickel finish leg irons from Chicago Handcuff Company. Made of nickel plated brass with very high quality construction and finish. Use standard Darby style keys. Includes two keys stamped CHICAGO HANDCUFF. Inside perimeter of medium: 9" to 10 1/4", weigh 3 lbs 1 oz. Inside perimeter of large: 11" to 12 1/4", weigh 3 lbs 2 oz.