We are going to try the full belt option at some point so hoping this Mature Metal Jailbird can be useful to someone else. Details: 1 3/8" Cage Inside Diameter 1 7/8" Oval Base Ring Inside Diameter 2" Cage Length 3/8" Gap Has 2 Security Screws and One (1) Key. Pricing this low, but at a firm $170 to avoid haggling and let someone try a quality device inexpensively. Shipping is within the U.S. and payment via PayPal preferred. PM me if interested at the price quoted.