DURABLE - Locking tuners prevent the from being exposed to and reduce the rust, which is more durable. EASY MOUNTING - Guitar Tuners comes with screws, bushings and ferrules for easy mounting. NOT LOOSEN - The tuned guitar string does not loosen easily. TUNE GUITAR ACCURATELY - With these tuning pegs, you can tune guitar strings fast and accurately. PREVENT SCREW SLIPPAGE - High quality internal , it's effective to prevent screw slippage. Locking tuners prevent the from being exposed to and reduce the rust, which is more durable. Comes with screws, bushings and ferrules for easy mounting. The tuned guitar string does not loosen easily. With these tuning pegs, you can tune guitar strings fast and accurately. High quality internal , it is effective to prevent screw slippage. Suitable for conventional size acoustic guitar and electric guitar. Condition: Weight:Approx. 168g / 5.9oz Tuning Size:Approx. 4.3 * 3.8cm / 1.7 * 1.5in Ferrule Outer Diameter:1.4cm / 0.6in Suitable for 1cm / 0.4in diameter hole colour:gold Material:Metal + synthetic plastic Package Contents: 6 * Guitar Tuning Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.