Things I liked:If you have to shim a 1'' scope these are the rings to get. The inserts will not let the shim's spit out. The price is great. Used them on a gamo bone/collector with serve barrel droop on top of a BKL mount with .030'' of shims. They can't come out. Things I would have changed:I like to fix my own stuff. What others should know:The studs are 3/16'' +/- might pull out if you tighten them to much. Just take a punch and spread the splined end out a little works fine.