I bought the 7573 peg mounts for their compact size and nice style. I installed them on a 1/4" steel plate and they didn't clamp properly. The supplied screws were too long, and bottomed out in the mount. I shortened the screws by a couple of threads to solve the problem. The alternative would be to add washers, but that would compromise the ability of the supplied star washers to resist peg rotation under load.