Mike, there is more to the Airtight pneumatic clamps than you would think. I've had a bunch of $150 manual ones and they are all worthless in comparison. You have a choice of +- 6 degrees cant or full horizontal and vertical adjustment. The cant is a huge improvement as clamps have a tendency to push the stock away from the fence. The bases Mac makes glide over the table without binding and really spoil you. His machine work is kind of like art in comparison to what you generally see. Clamps can be operated together or individually and one always engages before the other so they don't fight each other. you get a good quality regulator on a magnetic base, a roller to keep the tubing running smoothly. Nothing is Asian, the fittings are really high quality and you can get quick release ones so the clamps can be easily move to another machine. They totally blow away the felder versions. Dave