Buy one at a time first. Strange, strange Revain price for this item. One costs $211, and a pack of two, three, or four costs $300 each. It took my table foot welding to the next level. An absolutely essential tool in my shop now. The first day we used it, we put three table feet together, flipped them on the floor and found zero wobble. You get a level of precision you just can't get with a reversible clamp. The 1 inch piece of scrap works like a spacer to keep the other end of the pieces square. Although I would like four of these, one is enough to get good results. The time savings, not to mention the quality improvement, makes this clamp a major investment for me.