A right-handed set of Ratio Tuned Machine Heads in waffle-back look for electric guitar that use 6 in-line side tuners. Open backs. Fits vintage style guitars (e.g. Fender Style). Ratio - Tuned Machine Heads incorporate different string gauges into the tuning equation. From Low E to High E 39:1, 24:1, 20:1, 35:1, 20:1, 12:1. We balanced the gear ratios to each string simplifying the tuning process. With Ratio, a half turn is a semi-tone! Every string reacts the same to any tuning adjustment. Predictable, precise tuning on every string. Please note that our waffle-back tuners are made to a vintage specification (for 11/32” peghead holes) and will not be a direct replacement for a modern tuner.