The simple and effective design allows you to separate the master links to remove the chain from your drivetrain for service or replacement. Open the pliers, rest the left side of the plier to the pin and the other jaw to the outer link and squeeze the pliers to pop the link. It doesn't get any easier that.
The C-220s are produced in Hozan's factory in Japan, no outsourcing here. The construction is hardened steel and the handle are rubber wrapped for added grip. Great design and a superb addition to you tool box.