Ldafava Chains Measurement Ruler,Bike Chain Wear Indicator, Stretched Chains Gauge Checking Tool, Chain Checker, Bicycle Repair Tool, Bike Chain Wear Indicator for Mountain Road Bike

Features: Made of good quality carbon steel, sturdy, anti-rust and durable. ".75" and "1.0" dual measurements design, can judge the state of chain whether it needs replacement. Useful tool for bike maintenance, can help prevent worn chain from breaking or causing damage to other parts. Specification: Material: Carbon Steel Color: Black Function: Check the state of bike chain Suitable for: single/6/7/8/9/10 speed Size: Approx. 140.5 * 47 mm / 55.3 * 18.5 inch Weight: Approx. 45 g Package List: 1 * Chain Wear Indicator Only Noted: If the ".75" side can insert into the chain link, which means the chain needs to be replaced, if the "1.0" side can insert into chain link, which means the chain must to be replaced to prevent worn chain from damaging crank and cogset.