The Parallel Guide Extensions are for use with any length Festool FS/2 Guide Rail (sold separately).
For a better value, purchase the Parallel Guides & Parallel Guide Extensions as a Set (#203160).
The Parallel Guides greatly enhance the capability of the Festool Guide Rail System by providing a faster, easier, smarter way to create consistent rip cuts. The Parallel Guides offer consistent rip cuts using two adjustable stops that engage the edge of the material parallel to the cut line.