Description: 【Sealed Bearing】: This bike headset features sealed deep groove ball bearings with a metal seal, ensuring high speed performance, The design effectively retains lubricants within the bearings, providing good dust and water resistance for smooth and effortless fork integration 【Aluminum Alloy Construction】: Made from quality aluminum alloy, this headset offers durability and strength while maintaining a lightweight profile, enhancing the overall performance of your bike 【Compatibility Specifications】: Designed for frames with a head tube inner diameter of 44MM (both top and bottom) and suitable for straight tube forks with an upper outer diameter of 28.6MM and lower outer diameter of 30MM 【Single Unit Packaging】: Each purchase includes a complete headset unit, providing everything you need to enhance your bicycle's steering precision and reliability in a convenient package 【Compact Dimensions】: With product dimensions of 4.9 x 4.9 x 6CM, this headset is compact yet sturdy, making it an ideal choice for cyclists seeking reliable front fork accessories Specification: Material: Aluminum Alloy     Size Chart: 4.9cmx4.9cmx6cm/1.93inchx1.93inchx2.36inch Package Includes: 1 Bike Headset Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.