Features: Fine Workmanship: The 6L/6R guitar string tuning keys tuner machine heads knobs kits are made of quality zinc alloy material, sturdy and durable, just good quality, classical designs button for you. Accurate Designs: The 1:15 ratio tuning pegs are great for guitar tuning, precise engineering enables sure, smooth tuning. With these tuning pegs, you can tune guitar strings fast and accurately. Easy to Install: Comes with adequate mounting screws and best for easy mounting. The tuned guitar string does not loosen easily. Perfect For: Guitar locking tuning machines with heavy-duty internal gear, sturdy and convenient. Easy to install, and easy to replace your old or dirty guitar machine heads knobs tuning pegs. Application: The locking tuners prevent the guitar from being-exposed to air and reduce the rust, more durable. And with the quality internal gear, its effective to prevent screw slippage. Specifications: Material: Zinc Alloy Color: As The Picture Shows Package Weight: approx.230g Style Options: Left/Right Size: approx.3.9x2.2x2.2cm/1.53x0.86x0.86in (More Size Detail, Please See Photo.) Package Includes: 6Pcs x Guitar Machine Heads (6R/6L) 6Pcs x Mount Screws note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thanks!