Bike Stem Riser Adjustable Bicycle Handlebar Extender Increases Bar Height Up to 5.3" for Most Bicycle Road Bike, MTB, BMX, Cycling Tights ensuring the handle is firmly

ensuring the handle is firmly attached for stability

Gray Dimensions: Diameter approximately 2

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In case you still have doubt or you find this is a missing part during installation

Bike Stem Riser Adjustable Bicycle Handlebar Extender Increases Bar Height Up to 5.3" for Most Bicycle Road Bike, MTB, BMX, Cycling Tights ensuring the handle is firmlySTURDY MATERIAL: The handlebar height adapter is made of refined aluminum alloy, high toughness, no deformation, corrosion resistance, sturdy and practical. DOUBLE SCREW FASTENING: The bike handlebar extender is equipped with double screw locks and steel screws to make the handlebar tighter and prevent the handlebar from loosening and falling off, reducing hidden dangers when riding. ADJUSTABLE HEIGHT: The height of the bike fork bar extension is 13.