You have to get that handlebar height just right. It's more comfortable, more efficient, and helps keep your entire upper body healthier. Wheels Manufacturing has your well-being covered with a wide variety of sizes to ensure your bars are right where they need to be. Aluminum headset stack spacer precision cut to ensure proper headset function. Spacers are sold individually Thickness: 10mm Color: Silver S.H.I.S. Stem Clamp Diameter: 25.4 Defined Color: Silver