Bike Chain Breaker: Made of high-quality stainless steel, very strong and will not bend. The metal frame has a comfortable rubber non-slip handle. Attach the chain hook to the chain before disconnecting the chain. After the chain hook is installed, select the shackle that needs to be removed, and use the chain remover to remove the hook. Bike Chain Wear Indicator Checker: Premium Material: Forged from carbon steel for hardness and toughness. The fuselage is blackened and phosphating treated, anti-rust and wear-resistant. When the chain wear checker indicates 0.75 (75%) wear, it is time to replace the worn chain. Bike Chain Ring Pliers: Made of high-quality stainless steel with a non-scratch black finish and a super comfortable rubber non-slip handle. Use pliers to quickly remove the connection link. Advanced tool to turn on and off master link removers and connectors Compatible with almost all 1 - 12 speed bicycle chains, such as: City Bike / Electric E-Bike / Mountain Bike MTB / Racing Bike / BMX HIGH QUALITY PRODUCTS FROM MMOBIEL: Every part is tested before shipping. Stock items.