Very simple. Wouldn't buy again. The clamps look serviceable but are very disappointed with the length (which sure was described. Just checked), thickness and screw size. I'm afraid he won't be able to handle what I already have from Rockler. I took them to use elsewhere and the first thing I will do is replace the small screws. This is one of them. Get what you paid for me in points. See user photos. I plan to release along with the Rockler version.