●Handlebar end plugs are made of quality aluminum and premium plastic, lightweight, sturdy and durable ●Bicycle bar end plug screws so that the plastic insert is inserted into the handlebar and applies to most bicycle handlebars with an inner diameter of 17.5-21.9mm ●Easy to install and remove handlebar end caps and replace cheap end plugs ●Tighten the screws to open the plastic insert and insert the handlebar. Easy to install on your bike and anti-skid Ideal accessory for motorcycle enthusiasts ●Suitable for handlebars: Approx. 0.9 - 0.9 inches (22 - 24 mm); Inner Diameter: Approx. 0.7 - 0.8 inches (17.5 - 21.9 mm)