Description: 【Premium Material】: The Calibration Tool is made of premium pp and silicone materials, lightweight, sturdy, and ensures a long time to use 【Easy Installation】: The Bike Seats Calibrator is easy to install without complex tools, compact size, easy to carry 【Bicycle Handlebar Aligner】: Maximise your riding performance with handlebar aligner. Attach it to the middle of your handlebars and then align the rays to the centre of your tyres, no time or skill required 【Function】: In addition to handlebar adjustment, you can also adjust the saddle position to meet different needs and improve riding comfort 【Effective Solution】: The Cycling Handlebar Calibrator is a must have for every cycling enthusiast, suitable for handlebars with diameters from 22.2mm to 31.8mm, improving performance and reducing trips to the repair shop Specification: Material: pp Size Chart: 11cmx7.6cmx5cm/4.33inchx2.99inchx1.97inch Package Includes: 1 Bicycle Calibrator  Note: Please allow slightly errors 1-2cm differences due to manual measurement.