High quality 304 stainless steel with a chrome finish, Not nickel chrome plated like most other available on this site. High quality metal work, no weld spots, rough edges or cheap fabrication New style hidden lock system - won't catch on clothing like a conventional padlock The back ring is ergonomically shaped for a comfort fit, the pain ring can detach if not wanted or to use intermittently Cage length: 39 mm. Cage Diameter: 33 mm. Back ring diameter: 50 mm Highest production quality without compromise, hand made and hand finished