I picked up a set of these and they worked great. Put these on a set of 6" trigger clamps and you a very fast way to help hold drawers at 90 Degrees. I don't find they provide much clamping force, but I don't they need to do that. They algin the edges and hold it at 90 degrees so you have two hands free to micro adjust and pin the drawer in place while the glue sets up. I found you can do a whole drawer this way and by the time you are done you can remove the fronts and go right the bottom to lock into square. I've seen other solution and used some. The trigger clamp is the fastest simplest I've used. I like them so much I'm leaving them on a set of clamps permanently.
