The Grover Sta-Tite 97-18 series tuning machines offer you smooth and precise tuning thanks to their 18:1 gear ratio. With open gears and a stylish die-cast plate with a butterbean button, these high-end machines provide a classic look and feel. The vertical orientation fits most solid headstocks, with a 22/64" post hole and hardware for easy installation. For slotted headstocks, the horizontal orientation has a 16/64" post hole. You'll appreciate their smooth tuning and stylish aesthetics. The 97-18 series delivers high performance and reliability for your instrument.