Ratio tuners, period. Once you tune with them, you will never want to tune with anything else. G and low E -- a breeze. I put them on a number of guitars, including Heritages, and even a bass with no drilling whatsoever -- they come with a variety of little adapter plates that match up with the holes of most other tuner brands. The plates that come with the tuners have a dull finish, but you can buy plates with a variety of finishes, if that matters to you. I just use the ones that come with the tuners.
