Bicycle Chain Measuring Ruler Bike Chain Checker Wear Indicator Gauge Cycling Repair Tool

Features:
Made of high quality stainless steel material, durable and long service.
Mini in size and light in weight, easy to use and carry.
Practical tool for quickly measuring the chain wearing degree, convenient for you to make a replacement.
If the ruler cannot be inserted into the chain gap in 0.75% and 1% size, the chain works normally. Otherwise, it means that the chain needs to be replaced.
It is not only a bike chain checker but also a chain hook, compatible with all chains.