MTB Bicycle Bike Handlebar Riser Stem Extension Fork Shaft Extension NEW Feature: 100% brand new and high quality! Made of high strength CNC machined alloy, better intensity. Easy to install, just attach it to the original front fork stem. Convenient to use when the handlebar is height adjustable. Can extend the fork stem by 70mm maximum. Suitable for mountain bike to increase the handlebar fork stem. Specification: Color: Black Material: High Strength Alloy Base Connector Diameter: 1-1/8"(28.6mm) Steerer Tube Connector Diameter: 28.6mm(Standard) Max. Height Adjustment: 70mm Total Length: 12cm/4.7in Package Included: 1 x Handlebar Stem 4 x Stem Adjuster 1 x Top Cap(with long screw) How to Install: Take off the screw and top cap of the front fork stem, then take off the bike handlebar stem. Put the steerer tube extension onto the steerer tube and adjust the height by selecting spacers. Reinstall the bike handlebar stem, top cap and screw on the fork stem.