Universal 50mm iler Tow Ball Cover Hitch Ball Protection Cap with Screw Knob Car AcceoriesFeature:-Waterproof, Dustproof, Oilproof: Made of good quality ABS plastic material, waterproof, dustproof, oilproof, etc.-Prevent Loosening and Falling: iler coupling guard sits firmly on the ball head, with a screw knob to prevent loosening and falling-Replacing Old Cover: Tow bar ball cap works for replacing your old iler coupling cover, very practical-Protective Cover: iler hitch ball protective cover is applicable to trucks, semi ilers, cars, shs, etc.-Service Life: Tow bar ball cap come with stable structure, excellent performance and service lifeSpecification:Product material: ABS plasticInner diameter: 50 mm/1.97"Product color: Glo Black/SierFunction: waterproof, dustproof, oil proof, etc.Application: iler hitch ball protective cover for trucks, semi-ilers, cars, shs, etc.Attention:Please ensure the size of your iler tow ball. The size of this product is suitable for 50mm iler tow ball.Note:1. There may be slight size deviations due to manual measurement, different measuring methods and tools.2. The ture may not reflect the actual color of the item beca of different photographing light, angle and display .