Description: 【Bike Stem Spacers】: This product is a comprehensive Bike Headset Spacer set, designed to fit 1 1/8 inch (28.6mm) bike forks, great for adjusting your bike's handlebar height 【The set includes a variety of spacers】: 1pcs 2mm spacer, 1pcs 3mm spacer, 2pcs 5mm spacers, 3pcs 10mm spacers, allowing you to customize your riding according to your comfort and needs. 【Quality Material】: Bike Headset Spacer is made from -quality aluminum alloy which ensures durability and longevity while maintaining lightweight performance 【with Stem Top Cap, Star Nut】: In addition to the spacers, this set also includes a star nut, top cap cover, and bolt for complete installation or replacement of your current headset setup 【Easy to Install】: These handlebar spacers are easy to install and can significantly improve your cycling experience by providing optimal handlebar height adjustment options Specification: Material: Aluminum Alloy Size Chart: Spacer Height: 2mm, 3mm, 5mm, 10mm Inner Diameter: 28.6mm/1.13inch Outer Diameter: 33.9mm/1.33inch Top Cap Cover: 31.8mm/1.25inch Star Nut: 27.5mm/1.08inch Bolt: 36mm/1.42inch Package Includes: 1 2mm Spacer 1 3mm Spacer 2 5mm Spacers 3 10mm Spacers 1Pcs Star Nut 1Pcs Top Cap Cover 1 Bolt(4 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.