This elevator ring has owner-drilled holes from felt pads attached with screws. There are also various scuffs, nicks, and scratches on the elevator ring. The owner-added felt pads very slightly increase the height of this ring. 

24.5" diameter clip to clip. 

To ensure the proper fit, please measure the Black Nylon Ring on the bottom of your chair. The Elevator Ring attaches to this Black Nylon Ring. You need a Black Nylon Ring with an outer diameter of 24.5".