"This wheel features Grants exclusive dual-plane spoke design. This 3-dimensional hi-tech, dual-plane 4-spoke design offers a world class look. A Grant Installation Kit is necessary to mount this wheel to a vehicle. This wheel will work with any Grant Standard 3000 or 4000 Series Installation Kits. It WILL NOT work with Grant Billet or Euro Installation Kits. Note: The eight bolt pattern you see around the horn button is decorative only and this wheel is still a three bolt pattern beneath the horn button."