The Rhino J Bolt "Long" is a great 4wd accessory that allows you to safely secure a spare wheel to a Rhino heavy duty cross bar freeing up much needed cabin space and maximizing your carrying capacity. Easy to use the J Bolt works by hooking around the underside of a heavy duty cross bar the bolt is then feed up through the wheel stud hole and fastened. The cross bars will need to be adjusted to a close proximity allowing a suitable width to to rest the wheel on.