This front hub assembly is designed specifically for Trailmaster and Hammerhead go-karts and UTVs, making it a perfect replacement part for various 150cc, 250cc, and 300cc models. The assembly comes complete with sealed bearings and studs, featuring precise bearing bores of .589 inches for the small bearing and .785 inches for the large bearing. Constructed from durable alloy steel, this OEM-specification hub is compatible with multiple models including Trailmaster 150 XRS, 150 XRX, Blazer 150, 200E, and 300 series vehicles. It's important to note that while this assembly includes the hub, bearings, and studs, it does not include the brake disc or wheel nuts. This versatile component also fits many other Chinese-manufactured go-karts, making it a reliable replacement part for your recreational vehicle maintenance needs.