I got a set for a 2018 PRS SE Custom 22 which needed them for the final detail in the tuning stability puzzle. They are drop in, so easy work. I noticed one of the washers was too thin, a QC issue and a first. I have bought many sets of HB locking tuners and this is the first little glitch in QC. No sweat, I just used one of the originals (probably made at the same facility). I wish the knobs were bigger to match the original look of the guitar. I have done a swap of knobs on a PRS se One with no issues, but it didn't work here for some reason, being that the holes on the PRS knobs were too big to get a tight fit. The screws are a little thinner than the PRS, so use the existing ones, or plug the the holes for a tight grip. FWIW.