Mountain Bike Handlebar Front Fork Stem Riser Extender Extension Head Up Adaptor. Product Specifications Type: Handlebars Fork Stem Riser Material: Aluminum Alloy Surface treatment: aluminum oxide size: Height: 120mm Inner diameter of down tube (contact with front fork): 28.6mm The outer diameter of the upper tube (where it fits with the stem): 28.6mm Product Features Made of high-strength aluminum alloy, anti-corrosion, non-deformation, and durable for long time use. Can add or remove washers for your own height. Easy installation, just connects up the original front fork stem. Suitable for mountain bicycle to rise up the handlebar fork stem. How to Install: 1. Insert STEM-UP onto the fork stem and place height adjusters onto STEM-UP until your preferred height level for your stem. 2. Stem and wheel in the same direction and heighten clamping bolts of the stem. Note Please check the diameter of the front fork tube before purchase Package Include 1 x Bicycle Extender, 3 x 5mm washers, 1 x 10mm washer