These are made of steel, plated with brass, and have a shiny brass finish. Not very heavy, just simple stamped steel. Measures about 1-5/8″ by 1-1/8″ outside, and the center opening is about 1-1/8″ by 3/4.” Two prongs on back makes it easy to attach. These are old stock, recovered from a closed factory; expect some grime and stains on them.