6 7/8" WHITE Round RV Ceiling A/C Plastic Vent 7/8" Collar Covered Screws
Louvers Open, Close & Rotate.  Screw in collar.  Then vent snaps into collar and screws are covered. Nice clean look without the screws showing.

US Shipping $6.95 for the first one.  Add $2.50 for each additional one.

Front face:  6 7/8" round
Collar: 7/8" 
Requires 5 7/8" hole for installation

Please let me know if you have any questions.
Thank you,
Babette