Features: Our cyclists knee joint gauge aids in adjusting bicycles component to achieve perfectly body bike alignment, boosting comfort, efficiency, and performances. Features a compacts, extendable design allowing for convenient storage when not use, making it essential tool for any cyclists. Simply follow the directional arrows to accurately use this cycling arm leg angles finder, ensuring precise measurements for improved cycling postures and comfortable. Equipped with a hanging hole, you can easily store your bicycles joint protractor on hook. Make from Plastic and Metal materials, this bike fitting postures angles measurement tool promise long terms durability. Specifications: Materials: Plastic and Metal Size: about 143x64x20mm/5.63x2.52x0.79inch Unfolding length: about 360mm/14.17inch (maximums) Package Includes: 1pc Bicycles Joint Protractor note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.