Features :  This is an essential tool to have for anyone working on their own machine. Remove chains and extra links with ease. Fits chain sizes 415, 420, 428, 520, 525, 530. Replaceable press pin is heat treated and hardened Please be sure to verify that the push pin is aligned properly with the chain pin. It is recommended to grind off the chain pin head before using this tool. This will significantly reduce the load on the tool and help prevent premature wear or damage to the breaking tips. Installation instructions: 1. Unscrew bolt "A" so that the pin "C" is fully retracted into the bolt "B". 2. Unscrew bolt "B" and position the chain under "B", so that the ends of the chain pin can fit into the    holes "D" adn the bolt "B". 3. Thread bolt "B" in until the chain is clamped in place, against the hole "D". 4. Turn bolt "A" to push the chain pin head out of its plate. 5. Repeat the operation on the second pin of the link to be disassembled.   Package including : 1pc of the Chain Breaker tool