Product Description Kaynes 6 In line (6 Right Handed)  Locking Guitar Tuners with 18:1 Gear Ratio Fits most Electric or Acoustic Guitars with headstock which has modern 10mm tuner holes and 45 degree fixing tag The locking mechanism holds the strings securely and feels pretty smooth when turning to tune Hold tune decently and are very easy to use, just slip the String though the hole, tighten the Locking Thumb Wheel, then Tune the String Durable and solid well made; Provide finer tuning and greater stability Please choose the correct configutation for your headstock and make sure your headstock has 10mm tuner holes with 45 degree fixing tag; Package includes whole set with tuning keys, bushings, washers and screws. Made in Korea. Heart Shape Button Style Machine Heads. Gotoh Style Machine Heads. Material specification: Zinc Alloy Color: Black,Available in Black and Silver Number of Strings:6 Size:As shown in the picture. Package Includes: 6 x Guitar machine head (6R) 6 x Ferrules 6 x Threaded Bushings 6 x Screws Product performance: The back rotating compass can lock the strings, the hand feels delicate, the tuning is accurate, and it is more stable. If you have any questions, feel free to contact us.