Add a flash of color to your handlebars. Alloy Bar End Plugs are precision engineered and machined using lightweight durable 6061-T6 aluminum. They are compatible with mountain and road bike handlebars thanks to an expanding wedge that makes a secure fit for most inner bar diameters. Available in a variety of anodized color options that match Wolf Tooth headsets stem caps seatpost clamps bolts and more. Works with mountain and road bike handlebars. The expanding wedge makes a secure fit for most handlebar diametersCompatible with handlebars measuring 18 mm to 21.5 mm inner diameterAlloy plug outer diameter: 26.6mmUse 3 mm hex tool (not included) to secure bar end plugs. Tighten until snug; do not overtighten