Genuine Tone Ninja 19:1 Locking Tuners, 7 String inline set, Black

Includes the 7th tuner that fits a string gauge up to 0.085 which is good for bigger string gauges. Affordable and is a drop-in fit for an Ibanez RG7421. No issues with gear mechanism it turns just fine with a good gear ratio for precise tunning. My first time trying this product I have 8 guitars and put locking tuners in all my guitars. It’s worth looking into!

They come untuned and you have to supply your own white grease aka lithium grease