These Super strong black oxide steel Fence Clamps using a sacrificial fence or quit block so simple you will question where they have actually been all your life. Merely drill a 7/16" hole in anything you intend to clamp to your saw's fence and then insert the straight side of the clamp right into the hole and place the clamp side on the back of your fence. I directly make use of these in my store, I have one that is utilized along my miter saw fence that I have attached to a timber block that I reduced at a 45 degree angle. It is excellent for reducing repeatable sizes for structures or any work. I also have one on a straight block of timber that is affixed to my router fence as a stop block.