Each 4" x 4" go-kart live axle hub comes with a 2-3/4" hub length, 1" axle diameter with a 3/4" step-down, and uses a 1/4" keyway slot. Includes four lug nuts Great for golf kart rims on a go kart. High quality thick metal,heavy duty and durable,long service life Works with go karts and dune buggies with 8” wheel Aftersale:Always feel free to contact us for a refund or replacement if there is any issue.