For such a simple part, these are great! For the output, Jack on my guitar I needed to slightly enlarge the hole in the center. This was easy to do with a simple step bit. I don’t mind making modifications because that’s what I like to do. The fact that the center hole is slightly undersized is a good thing. If I had a smaller output jack or the ones with the flat sides, it would’ve been perfect as it is.Glad I went with the off-white, bone color. It’s a perfect match for the aged white 1970s guitar I have.Recommended