ADJUSTABLE HEIGHT - The handlebar adapter is equipped with 4 spacer rings, 3 x 10mm and 1 x 5mm, increase height adjustable by 85mm MADE OF ALUMINUM - 6061 aluminum height adapter is 20 percent lighter than conventional aluminum alloy stem extenders. (see Figure 4 for more details) ADJUSTABLE - Permanent flexion of the spine on long bike tours can cause annoying back pain. Thanks to the handlebar risers, you can make bike tours more comfortable EASY TO ASSEMBLE - Just connect the original front bicycle fork stem. The stem extension can be used on most MBT bikes COMFORTABLE - The adapter is easy to assemble and adjust, even while driving. Adjustable even while driving Product description SPECIFICATIONS Name: Bicycle handlebars Material: 6061 aluminum Diameter: 28.6 mm Fits: 11 or 8 " or 28.6 mm steerer tube Height and spacers: 123mm: 3 x 10mm and 1 x 5mm spacer 138mm: 5 x 10mm spacers 185mm: 4 x 20mm and 1 x 10mm and 1 x 5mm spacer Weight: 180 or 200 or 320 g 1. Remove the handlebar cover. 2. Remove the bicycle handlebar bracket. 3. Install the bicycle handlebars, adjust the position and tighten the adjustment screw. 4. Install the bicycle handlebar bracket and install the screws on the bracket. EASY INSTALLATION The handlebar is easy to install, not easy to loosen and can be used for a long time HEIGHT ADJUSTABLE The height of the bicycle handlebar can be freely adjusted as required, and you are more relaxed while riding