Weanas New MTB Bicycle Bike Alloy Stem Riser 1-1/8" Rise 28.6 x 117mm WIDELY COMPATIBLE - Work on mountain or road bikes with 1 1/8" threadless steering tube. ADJUSTABLE - 1 x 3/16 and 3x 3/8 Spacers included to allow you to adjust the handlebar to be rasied to your comfortable position. MAXIMUM HEIGHT - This bicycle handlebar stem extender can increase your steer tube up to 3.5". LIGHTWEIGHT & EASY INSTALLATION- This stem extender is lightweight, but extremely strong. GOODBYE DISCOMFORT- Take the discomfort away from your upper back, neck and wrist. Remove the cover of original bike handlebar Remove the handlebar stand Install the bike fork stem extender, then adjust the position and fix the adjustment screw. According to the height, you can increase some spacer rings. Install the handlebars stand and fixed the screws on the stand. Finally, install the cover of the bike fork stem extender.