Features： 1、Durable Material: Made of aluminum alloy material, it is wear resistant, sturdy and durable, and has a long service life. 2、Front Fork Hanging Core: The front fork hanging core does not damage the front fork, it is reusable, light weight and strong. 3、Scope of Application: High strength with front fork, suitable for carbon fiber or aluminum or iron head tube. Exquisite workmanship, beautiful appearance. 4、Expansion Lock Block: 3 sections are used. Compared with ordinary 1 section and 2 sections, the force bearing area is larger and the coordination is better. 5、Strong Compatibility: Compatible with standard 1 1/8 28.6mm head tube, standard M6 screw, applicable diameter is min. 23.5mm/0.9in, max. 25.8mm/1.0in. Specification： Item Type: Bike Headset Expander Stem Top Cap Material: Aluminum Alloy Weight: Approx. 31g / 1.1oz Compatible with: Carbon Fiber or Aluminum or Iron Head Tube Compatibility: Standard 1 1/8 28.6mm Head Tube, Standard M6 Screw Applicable Pipe Diameter: Min. 23.5mm / 0.9in, Max. 25.8mm / 1.0in Package List： 1 x Bike Headset Expander Stem Top Cap