Product Description [For 28.6mm Handlebars] The stem riser is suitable for most bike. Its downtube inner diameter (contact with the fork) is 28.6mm (1-1/8"), upper tube diameter (contact with the handlebar) is 28.6mm (1-1/8"), the tube length is 120mm.[Quality Aluminium Material] - The steerer tube extender is made of 6061 aluminium alloy, turning process, aluminium oxide surface, durable and corrasion resistant, only weight 180g.[Height Adjustable] - With 3 steel screws and 4 washers, there is 3pcs 1cm and 1pc 0.5cm aluminium alloy washer, so you can adjust the height of the stem by swapping spacers.[Easy To Use ] - The stem riser can be installed in the middle of the handlebar and fork, so that the height of the handlebar increased for adjustment, especially suitable for long-distance riders.[Application] - Fit for handlebar diameter 28.6mm (1-1/8"). Suitable for most road bike, fixed gear bicycle, mountain bikes, etc.