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BIKEHAND Bike Bicycle Chain Wear Indicator Tool Chain Checker Compatible with Shimano Sram Campagnolo KMC & Other Brands- 7 to 12 Speed Chains Maintenance for Road, Mountain & Hybrid Bikes
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Chain wear tool...What does the .75 and 1 mean on each side. Bonus points for if the holes in the tool do anything : r/bikewrench
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