Bicycle Chain Checker Wear Indicator Stainless Steel MTB Bike Mountain Bike Chain Hook Bolt Measuring Tool Gauge Ruler

Specifications: Product main material Stainless steel Product Color Silver Product size 125x42x2mm/4.92*1.65*0.08' Product net weight 29g Function Measure the degree of wear of the chain (0.75 means wear, 1.0 means severe wear); chain maintenance hook; measure length; measure thread diameter Instructions for use:1. Measure the degree of wear of the chain:- Insert a hook without text into the chain link and observe the end of the hook with text.- If it cannot be inserted at all, the chain is good;- If it is inserted to the value of 0.75, it means that the chain is worn but can still ride for a period of time;- If it is inserted into the value of 1.0, it means that the chain has been severely worn, and it is generally recommended to replace it immediately.2. Chain maintenance hook:- Use the two hooks on the back of the measuring ruler to secure the chain.- It is more convenient for maintenance and removal of the chain.- Avoid getting oil on your hands and the chain