Headset spacer kits are turned from solid bar-stock to ensure precise and parallel surfaces and guarantee proper headset preload. And they look great too.Kits includes a 3mm, 2x 6mm, and 2x 12mm, spacersItem SpecificationsColorSilverDefined ColorSilverMaterialAluminumS.H.I.S. Stem Clamp Diameter28.6 ThreadlessThickness12Thickness3Thickness6 Chris King Spacer Kit 2 Headset Stack Spacer UPC: 841529201840