This is the Front Bearing for the AquaCraft .18 Inboard Marine Engine used in the Sport .18 Hydroplane. FEATURES: Constructed of steel INCLUDES: Front Bearing (part #12) for the AquaCraft .18 Engine REQUIRES: Installing in front of crankcase SPECS: Outer Diameter: 17mm Inner Diameter: 9mm Thickness: 5mm Oznaczenie producenta : aqug4101