HIGH STRENGTH -- 6061 Aluminum alloy bicycle stem riser is 20% lighter than ordinary Al alloy stem extender. Solid and firm handlebar extender that is hard to loose, more safety when use. Strong in anti-corrosion and rust-free, high toughness and not deformed, ? FUNCTIONAL GASKETS -- The bike neck extender is equipped with 4 Spacers, 3 x 5mm and 1 x 10mm, can increase the height up to 85mm. (more details refer to Figures), ? ADJUSTABLE -- The stem riser can adjust the spacers to fit your need freely, reducing the pressure on the waist effectively, biking more relaxed, ? EASY INSTALLATION -- Just connect up the original front bicycle fork stem. The handlebar riser can apply to most of the MTB bikes, ? COMFORTABLE CYCLING -- Handling more flexible, light weight(175gms), much easier to force when climbing, operation is comfortable, convenient bike fork extender.