3R 3L Guitar Reeds Sealed Strings Locking Tuning Keys with White Pearl Button for Electric Acoustic GuitarMaterial: This guitar tuner pegs with zinc alloy construction. Tuning nails are anti-rust, anti-corrosion. It has stable working performance, durable and strong. These are an excellent value with ratios of 15:1 to get these voltages quickly. They include an integrated pin set that follows the string lock knob so the pin retracts easily as the knob is reversed, making them less likely to get stuc. Exactly: the gears are made of high quality, which can effectively prevent the screw from slipping. Tuned guitar cable is not easy to loosen and no melody, and it can also respond to the slightest rotation. Easy to install: you need to drill small holes on the back of the headstock, the knobs are screwed and can be replaced, each "axis" knob installation has an independent through-hole nut if the lock doesn't go far enough on some tuners to lock the high strings. The solution is to place these on low strings, as they don't have to close the space. Package includes: 6 reed machine head (3 pieces to the right and 3 pieces to the left), 6 nuts, 6 washers, 6 mounting screws. Lock bands add extra mass that helps with a starved bolt sustain on the beauty style featuring knife edges floating tremolos. Color: Black Material: Zinc Alloy Package Contents: 6 x Reed Machine Heads (3 pcs