ECS Tuning 15mm hubcentric wheel spacers; anodized aluminum. Wheel spacers offset wheels to improve vehicle appearance and handling. These flat discs with center holes and wheel bolt holes fit between wheels and hubs to push the wheels outward. Wheel spacers from ECS Tuning come in thicknesses from 3-20mm, to widen track, improve cornering, and provide extra room for altered suspension and brake components. Extra length wheel bolts in the kit compensate for the shims to ensure proper bolt penetration, keeping your wheels bolted securely to the hubs.