Product Information Description Measuring Guide Other Details Black plastic grommet with rotating top Closes when not in use for a clean, finished look Available in two diameters 18mm flange depth Price per box of 10 Office Ergonomics - How To Do I Need A CPU Holder? How To Reduce Back Pain Ergonomic Desks & Tables Need It Fast? We Can Help! See Our International Shipping Options Request A Quote Today The rotating top of the Richelieu Spring Grommet closes for a finished, clean look when not in use. Black plastic construction.