Useful tool for chain wear The chain wear indicator shows when a certain amount of wear has been reached. You can replace it before it becomes a problem to keep your bike in good condition. good condition and safe.Useful tool to measure the degree of wear of the chain. Check chain wearIf the other end does not engage, the chain is new, if it is partially stuck, it is worn, if it is completely stuck, it is heavily worn. Chain Hook2 hooks on the top of the integrated chain that holds the links during assembly. Its operation is more convenient, it avoids greasy hands and chain skipping so that you can work more efficiently. Thread Diameter MeasurementVarious sizes of round holes can measure M3 M4 M5 M6 M8 M10 thread, and the scale can be used to measure its length. Features: 2 bike chain tools. Compatible with all bicycle chains, easy to install and use. Size: 125mm. Material: stainless steel, easy to use and carry. Set of 2 chain gauges - For Shimano, Sram chains, quick and easy measurement of wear. Technical specifications: Material: stainless steel. Dimensions: 125mm Weight: 44g. Colours: silver, black. Quantity: 2 bicycle chain wear measuring rulers. Functions: Made of high quality metal, sturdy and durable. This tool quickly checks chain extension and wear to determine if a chain is good or bad. Warning: 1. Since measurements are taken by hand, the sizes indicated may vary by 1-3 cm. Please make sure you do not mind before bidding. 2. The color of the actual item may vary from the pictures, depending on your computer's display and brightness settings. Please take the actual color as the standard. Thank you.