This set of 4 Gotoh UPT Planetary Ukulele Tuners are made with Gotoh's high quality, modern manufacturing for smooth, precise tuning while maintaining a traditional look. The tuners have a 1:4 gear ratio, with a standard hex nut and washer to secure it on the front of the peghead and a locating pin on the back to stop rotation of the tuner body. The UPT tuners are made for headstocks that are 10 to 12 mm thick (0.39 to 0.47"), they are also lightweight at just 15 g (0.5 oz) each (including nut and washer).