EASY TO OPERATE AND INSTALL:The bicycle bells can be used with most pipe handles of 0.83 -0.90inch diameter specifications,use a screwdriver to complete the installation in less than 1 minute, very easy, come and try! LOUD WARNING BELL Bicycle ringtones will fit most mountain bikes and road bikes very well, Xthuge launches a clear bike ringtone to hear clearly，safety alarm for mountain bikes and road bikes. SCOPE OF USE AND APPLICATION Applicable to any standard straight bicycle or stunt skateboard handlebars, dirt bike, BMX, kid's bike, cruisersports bike and cruiser bike. PREFERRED HIGH QUALITY MATERIALS: Bicycle rings will not appear after a long time of use traces, durable, do not fade，bicycle bells are made of high quality aluminum and engineering plastic materials, which are anti-rust and anti-aging, enabling riders of both sexes to live longer. CLEAR AND LOUD RINGTONES ARE ATTRACTIVE Xthuge Bike Bells installation is very easy and using a screwdriver it is easy to attach the handlebars to the bell bracket in a few minutes. Due to the use of high quality plastic, the support is very durable, not easy to damage. Available in 8 colors Beautiful color Black Silver Gold Blue Green Red Purple Pink Applicable handlebar 0.83inch - 0.86inch (21mm - 22mm). Size approx 5.8 x 5.8cm (2.3 x 2.3 inch) Package Include One pack : 2 x Xthuge bike bell