1. PRODUCT SIZE: The distance between the hub mounting holes (center to center): approx. 78 mm/3.07 inches. Center hole diameter: approx. 22 mm/0.87 inch. for 3 lug hub live axle kart This rear wheel hub is designed by skilled craftsmen. Every detail has been professionally trained, with high quality, stable performance, high processing precision, exquisite workmanship and high reliability. for 3/4 hub wheel kart 2. This rear wheel hub is designed by skilled craftsmen. Every detail has been professionally trained, with high quality, stable performance, high processing precision, exquisite workmanship and high reliability. for 3/4 hub wheel kart 3. ALUMINUM ALLOY MATERIAL: This rear wheel hub is made of high quality aluminum alloy material, which is proof, resistant, high strength. Manufactured in accordance with strict quality control standards, and improved design can extend the life. for go kart wheels PRODUCT SIZE: The distance between the hub mounting holes (center to center): approx. 78 mm/3.07 inches. Center hole diameter: approx. 22 mm/0.87 inch. for 3 lug hub live axle go kart 4. COMPATIBILITY: This rear wheel hub is designed in accordance with the original factory specifications and perfectly matches your car. It is a replacement for four wheeled motorcycle ATV Dune Kart. Please confirm whether it is a replacement for your car before . for atv rear wheel hub EASY TO INSTALL: This rear wheel hub adopts a design that is firm and stable, no need to use other complicated tools, installation and replacement is very simple, just remove the original one