Use For: Road bike Headset suitable for mountain bike, MTB, BMX, race bike, scooter, etc. Specification: Applicable to 1-1/8"(28.6mm) fork head tube + 1.34''(34mm) frame head tube. High Quality Material: Bearing Headset is made of high quality aluminium alloy material, sturdy, durable and long service life. Precision hining, with high quality assurance of comprehensive performance. Fine Workmanship: Bike Bearing Headset has professional manufacturing, stable characteristics and high reliability, wonderful accessory for bikes. Easy Installation: Bearing headset has simple design, easy to install and remove, convenient to use. For installation issues, you can contact us at any time inline, we will reply you within 24 hours.