These were fitted to a Gretsch Boxcar roundneck. They replaced the rather cheap disapointing Grovers that came on the guitar as a stock fit. I replaced like for like, both were open tuners. Right out of the box i could see the attention to detail. They not only look great, you can see the quality in the workmanship. Prior to even fitting, i have to say that i was very impressed. I had these fitted by a local Luthier, as i wanted fitting done correct. If you handy with a drill, then these should not be too much of a problem to fit. The gearing is 18:1. Without a doubt they stay in tune longer, tune faster, have improved the string feel. They also look better. They really do improve the look of my guitar. Are the right style of tuners for my guitar. A very delighted customer. Arrived very fast as always.