I bought the Festool 4-11/16" Screw Clamps Pair for my Festool track. They work great and even though the track does not move when sawing without the clamps, you run a risk of a bumping off track which screws up the accuracy of the cut. If you have spent the $$$ to buy the saw and track combo, spend the little extra money for the Festool clamps. Yes, they look just like the Micro-Jig clamps BUT they are slightly different. In the area that the clamp takes the 90 degree turn, the material is a little thicker on the Micro-Jig clamp which prevents it from sliding into the rail on the Festool track. Yes, you could file off a little material but you risk the degradation of the strongest part of the clamp. The clamp purchase is well worth it. As a side note, after using the track, use some painter’s tape to the rubber strip on the under-side to remove dust and such. Just apply the strip and pull it off. This will improve the non-slip factor and life of the rubber strip.