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Chain Wear Indicator: A worn chain shifts poorly and wears sprockets at an accelerated rate. 0.75% and 1%, the points at which chain experts suggest replacement. A must for checking your children’s bike. And a best tool for a bike shop. Chain Splitter: Designed to quickly and accurately remove and install chain pins. Along with superior strength and durability, it features a handy "loosening shelf" to remedy stiff links after reassembly. The fine thread and comfortable size enable easy removal of even the toughest chain pins. Fits the following : Common bicycle chains of6/ 7/8/9/10 speed, Works for all common bicycle chains. bicycle missing link Compatibility: Because 6, 7, 8 speed chain of bike width is 7.1 mm, so the 6, 7, 8 speed missing link chain is compatible to all 6, 7, 8 speed chain. Because 9 speed chain of bike width is 6.6 mm, so the 9 speed missing link chain is compatible to all 9 speed chain. Because 10 speed chain of bike width is 5.9 mm, so the 10 speed missing link chain is compatible to all 10 speed chain. Package includes: 1 x chain tool 1 x chain checker 6 Pairs bicycle missing link for speed chain