Description Description: High quality material: The Bike handlebar riser is made of high strength refined aluminum alloy material, which is durable, highly stable and safe to use. Double Screw Fixing: The handlebar height adapter adopts double screw locking design, and the steel screws make the handlebar more firm, not easy to loosen and fall off, reducing the hidden danger of riding. Easy Riding: Bike Stem Adapter Properly adjust the handlebar height to make it easier for you to maintain traction on steep hills and bring you a comfortable and relaxed riding experience. Easy to install, just attach the bike fork stem to make your bikes bring more beautiful. Application: This Bike steerer tube extender is suitable for most bicycles, mountain bikes, road bikes, etc. with a 28.6mm threadless steerer tube. Size Chart: 12cmx3.5cm/4.72inchx1.38inch 12cmx3.5cm/5.12inchx1.38inch Package Includes: 1Bike Fork Shaft Extender 1Allen wrench Note: Please allow slightly errors due to manual measurement and different monitors.