Features1Adopt high grade steel material, durable, anti-rust and wear resistant for long term use. 2Clear printing and exquisite workmanship, reflect the guarantee of its quality, which will not disappear with the number of uses. 3Four types for you to choose - 41MM, 47MM, 49MM, 52MM. 4Use sealing rubber ring, can effectively prevent water and dust from entering. 5It is a helpful accessory for competition, mountain bikes, road bicycles, etc.SpecificationFeatures: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.Four types for you to choose - 41MM, 47MM, 49MM, 52MM.Use sealing rubber ring, can effectively prevent water and dust from entering.It is a helpful tool for competition, mountain bikes, rode bikes, etc.Specification:Item Type: Bearing HeadsetMaterial: SteelSize:P03: Approx. 40 * 30.15 * 6.5MM * 45 Degree / 1.6 * 1.2 * 0.3inch * 45 DegreeP17: Approx. 47 * 34.1 * 7MM * 45 Degree / 1.9 * 1.3 * 0.3inch * 45 DegreeP19: Approx. 49 * 37 * 7MM * 45 Degree / 1.9 * 1.5 * 0.3inch * 45 DegreeP16: Approx. 52 * 40 * 7MM * 45 Degree / 2.0 * 1.6 * 0.3inch * 45 DegreeWeight: Approx. 50-65gPackage List:2 * Bearing HeadsetPackage List