Durable The bicycle handlebar extender is made of 6061 aluminum alloy. After heat treatment, the handlebar is more stretchable, more resistant to oxidation and corrosion, not easy to disassemble and safer to use.Perfect for most bicycles The stem riser is suitable for most bikes with 1-1/8'' (28.6 mm) threadless steerer.Adjustable The MTB stem riser will increase the height to 70 mm (max). The bicycle stem can be adjusted freely to suit your height, effectively reducing waist pressure and making riding easier.Functional Spacers The handlebar riser comes with 4 spacers (1x5mm and 3x10 mm), so you can adjust the stem height by swapping the spacers.Easy to install Simply connect the original front fork to complete the installation. Our bicycle extension handlebars are suitable for most mountain bikes, road bikes, etc.