The product is a set of 4 black plastic wheel hub caps, designed to fit 52mm diameter wheels. These hub caps are specifically made for trailers and transporters, featuring an inner diameter of 50mm and an outer diameter of 50.9mm. The Neutral branding and United Kingdom country of origin add to the product's authenticity and quality. Perfect for protecting your trailer bearings and enhancing the appearance of your vehicle, these hub caps are a reliable and affordable solution for your commercial vehicle needs.