Grover Sta-Tite™ tuners are a modern version of a vintage design. For 3-left/3-right solid pegheads. Each tuner features 18:1 gear ratio for fine tuning, a cast baseplate, vintage style scalloped knobs, and nylon worm bearings and tension screw for smooth operation. Sets of 6 (3-left/3-right). Each set includes mounting screws and knurled press-fit peghead bushings. 11/32" (8.73mm) diameter pegholes required. Installation Tips Bushings: Get the right fit! Use a slow-speed 0.340"-diameter reamer to cut a clean, accurate counterbore for a professional job. Mounting screws: Pilot holes required. Installing delicate screws into hard wood requires great care and accuracy. We highly recommend a No. 50 bit for the pilot hole before installing these screws. Lubricate the screw threads with cutting lubricant (also wax or a bar of soap) to reduce friction and help them thread properly.