WEEROCK Folding Bike Stem Foldable Angle Adjustable Riser，25.4mm for Front Fork Head Tube，25.4mm for Handlebar Barbore, Aluminum Alloy Gooseneck Shape Length 140mm(5.5 Inch), Black

• Adjustable Anytime Anywhere: Even if it was installed on the handlebar, no tools are required. As long as opened quick release, the height of the handlebar could be adjusted anytime and anywhere by adjusting the angle of the riser. You could adjust the handlebar to the most comfortable position according to your needs Suits for: the diameter of handlebar barball is 25.4mm/ 1 inch and the inner diameter of fork headtube is 25.4mm/ 1 inch. Please make sure to confirm the diameter of these two places befor you purchase Locked after Install the Handlebar: The bike stem could be folded before installation, even if it was not opened the quick release. After installing the handlebar, if the quick release was closed, it would be locked. If you could fold the riser by hand after you receiving it, It does not mean there is a problem with this product. Material: Aluminium alloy material, which is very sturdy and rust resistant, the total weight is 0.64kg/1.4LB Please carefully watch the installation steps and installation video on this webpage. Due to the negligence of the workers, this batch of products did not come with an instruction manual. Sorry for this.