DOMED -Concave
aluminum snap-type plate has single clip riveted across full diameter.
Snaps to the ring at two contact points. Plate is 4-3/4" dia.
RECESSED - Recessed
center and flanged-edge design will not creep off center due to vibration
in propwash areas. 4-3/4" dia. x .020 aluminum. Will not twist or
vibrate.