Stylrtop Bike Bicycle Fork Stem Extender Bicycle Handlebar Riser Adaptor Aluminium Alloy Head Up Adapter Flexible Base In-tube Diameter:28.6 mm;Length:121 mm;Adjustable height:0-70mm The product equip with 4 gaskets,2 x 10mm and 2 x 5mm Made of aluminium alloy, looks firm and beautiful Adopts stainless steel hex screw, ensure lock tightly;The cap cover finish to size, perfectly suit to prevent the dust Suitable for mountain bicycle to rise up the handlebar fork stem,Many colors can choose, making bike cycling more joyful