The Tekonsha trailer wheel bearing grease caps help ensure grease stays inside your hubs and water stays out. These grease caps fits hubs with a bore diameter of 1.990 inches. They are sold in a quantity of two, enough for one axle. •Not designed for easy lube axles Simple press-in install Not easy lube compatible | Tekonsha Trailer Wheel Bearing Grease Caps - 1.990 Inch Diameter