Wide Compatibility: these guitar tuning keys fit 6mm peg holes, suitable for most electric guitar or acoustic guitar. Well Performance: tuners can hold the strings in place stably, turn smooth, allow the player to tune easily and accurately. Easy Installation: mounting screws and nuts, washers are included; it is ready for use, easy to install. Professional Tuning Pegs: semi-sealed tuning peg machine head are great replacement for your old, broken tuners. Specifications: Material: Zinc Alloy 43; Iron Color: Black / Silver (Optional) Typr: 3R 43; 3L / 6R / 6L (Optional) Product Weight: 135g / 4.76oz Package Weight: 160g / 5.64oz Package Size: 10*13*6cm / 3.93*5.11*2.36in Note: Guitar string tuning pegs only, other accessories in the pictures are not included. Due to lighting or other reasons, the picture and material object may slightly differ. Due to manual measurement, there may be deviation, please in kind prevail. Packing List: 6 * Guitar String Tuning Pegs