Description: Material: Our bicycle expansion bolt is made of high quality aluminum alloy, durable, lightweight and sturdy. Features: The bike headset top cap key expander plug screw adopts precision workmanship, reusable, stable and reliable. Design: Three petal long ratchet with strong force, having good non skid performance. Easy Install: The headset screw can tight fit and it is easy install and remove. Applications: This portable bike expander bolt is widely suitable for most bicycles, like folding bikes, etc. Specification: Material: Aluminum Alloy Size Chart: Suitable for front fork 2.86cm/1.13inch for 3cm/1.18inch Suitable for front fork 3.18cm/1.25inch for 3cm/1.18inch Suitable for front fork 2.86cm/1.13inch for 5cm/1.97inch Suitable for front fork 3.18cm/1.25inch for 5cm/1.97inch Suitable for front fork 2.86cm/1.13inch for 8cm/3.15inch Suitable for front fork 3.18cm/1.25inch for 8cm/3.15inch Package Includes: 1 Bicycle Fork Headset(4 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.