This bike headset adopts aluminum alloy construction, which delivers good stability and durability. And this product has CNC high precision machining and fine workmanship, which is colorfast and anti deformation. Another point is this bike headset is suitable for 34mm bike frame head tube and it is compatible for 28.6mm straight steerer fork. Features: HIGH QUALITY MATERIAL: This bike headset adopts aluminum alloy construction, which delivers good stability and durability. FINE WORKMANSHIP: This product has CNC high precision machining and fine workmanship, which is colorfast and anti deformation. SCOPE OF APPLICATION: This bike headset is suitable for 34mm bike frame head tube and it is compatible for 28.6mm straight steerer fork. CONVENIENT TO USE: This product is easy to install and use, which is a nice replacement part for your bike. If you are a bicycle lover, you deserve it. Specification: Condition: 100% Brand New Brand: Risk Material: Aluminum Alloy Color: Black For Frame Head Tube Top and Bottom Diameter: 34mm / 1.3in For Fork: 1 1/8" (28.6mm) Straight Steerer Fork Height: 14 + 12= 26mm Dimension: Approx. 4.5 * 4.5cm / 1.8 * 1.8in Weight: Approx. 116g Packing List: 1 x Bike Headset