Formed so the only point of contact on the window frame is at the circular base around the screw hole. The wings are raised slightly above the base and edges are curved so that in turning it will not gouge the wood. Zinc finish. Mounting screws included.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.