Spacers are an important connection between your handlebar and the rest of your bike. While used to adjust the height of your stem, they transfer important alignment from the bottom of your stem to the top of the headset. Lacking exactness, there will be little you can do to achieve and maintain proper adjustment. Each spacer is lathe-cut from high-grade aluminum bar stock in a single operation ensuring exactness of size, concentricity, and parallel surfaces. Now you have the choice of all the chris king colors when choosing your spacer. This kit consists of four spacers (3, 6, 12 and 25 mm) and fits on all 1 1/8 steerers.