With the Chain Breaker Tool, quickly and easily change the length of the 0.250" TETRIX® Chain with Links. Simply measure the length you need for your application, position the chain in the breaker block, and turn the side-mounted screw to remove a chain-linking pin. A connecting link (included in the TETRIX Chain with Links pack) is used to reconnect the chain. This tool is a must if you are planning on changing lengths often.