I was skeptical about these clips but found they work. It is easy to use and you can attach the clamps very quickly. I'm a do-it-yourselfer so look for something affordable (it costs less than a popular brand 90 degree clamp). It's a real 90 degrees and that's the most important thing. I used it on a small cabinet I was building and it's great for annealing and holding boards before adding pocket holes. At this price I recommend adding it to your tools.