Chain master links don't normally require a tool for separation. However, dirt, grime, and corrosion often makes it difficult to separate them over time. Designed for just this very purpose, Pedro's Quick Link Pliers allow you to easily separate corroded master links found on most chains, ranging from 5 to 11-speed drivetrains. Also, it'll work to separate the Powerlock connector found on SRAM's Eagle Chain for those running this 1x12 drivetrain.