Features:Adopt high grade steel material, durable, anti-rust and wear resistant for long term use.Clear printing and exquisite workmanship, reflect the guarantee of its quality, which will not disappear with the number of uses.External diameter 41.8MM, angle 45°, fits for your bicycles.Use sealing rubber ring, can effectively prevent water and dust from entering.It is a helpful accessory for competition, mountain bikes, road bicycles, etc. Specification: Item Type: Bearing Headset Material: Steel Color: Red External Diameter: 41.8MM Size: Approx. 41.8 * 30.15 * 6.5mm * 45° / 1.6 * 1.2 * 0.3inch * 45°