Features: The bicycles chain gauge is make of Aluminum alloy, which can used for long terms and rustproof. It can quickly detect chain wear and can used on almost any bicycles, such as city bikes, mountain bikes, road bikes. The circulating chain inspector is a good tool for checking the degree of chain wear. Portable, easy to store, and not occupy too much space. Easy to operate with one hand. The chain hook designs allows you to easily handle chain maintenance. Specifications: Materials: Aluminum alloy Color: Blue/Red/Orange/Silver Size: about 130x50x2mm/5.12x1.97x0.08inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Pc Bicycles Chain Gauge