These clamps work perfect with the Festool guide rail.They are especially helpful if you need to use the rail on a small piece. They are always out of the way, and stay clamped when they are tightened.
First of all, I like the wooden handles on these clamps. They are so useful on and off the MFT as well. They work perfectly inside the MFT side rails so that it's possible to hold boards at a right angle to the table table. Also, the 'hook' side of the clamps slip into the MFT table top holes to secure down wood for sanding, cutting, etc.
Off the table, the metal hooks slide into the ends of guide rails enabling rails to be locked down on a piece of wood. This is great for aiding in short cuts with a TS circular saw.