I know the price seems reasonable but I don't think they are worth it. Mine was glued crooked and there were 2-3 small dents on the FINE side where there was no diamond. I didn't think they would make a difference as they are really quite small, but I can feel it with every hit with almost every tool I try to sharpen. They also seem pretty flimsy and I installed them on a piece of wood but I'm pretty sure they still don't give me a really flat surface. I don't feel that they are doing their job despite all my complaints as it seems to me that the diamond is either worn too easily or is not quite a diamond. looks like fine sand. And yes, I know how diamond stones are supposed to feel.