These worked far better than I expected, initially when I first unboxed them I thought they would not clamp anywhere well enough for using them with a circular saw or saw bench! And felt a little disappointed as they are them friction type clamps where an angled bit of metal is wedged under pressure and I would rather see a screw clamp, well I had them so I gave them a go and found out my fears of quality was so wrong, I used this as a guide on a saw table and it did not move 1mm when cutting a long 2.4M sheet of ply, turns out it is a perfect additional guide for my saw table and router table.