Aretainingringisafastenerthatholdscomponentsorassembliesontoashaftorinahousingorborewhentheyareinstalled.Theseretainingringsareinstalledintomachinedgrooveswithinternalhousingsorboresoronexternalshafts.Theexternalretainingringisabletohandlemoreforcethrownatthemthanastandardretainingring.Theseretainingringsaremanufacturedwithlugholes,smallholesinthelugsofbothinternalandexternalre tain inrings.StainlessSteelmaterialenhancesresistancetorusandcorrosion.ThisringiscompatiblewithAestiva7900,Aestiva7100andAestivaMRI.