Guitar Tuning Peg Gears, 6pcs Classical String Tuner Machine Head Gear 4mm Inner Hex Hole

[Sturdy And Durable] Made of iron material, ensuring long-lasting use [Prevents Guitar String Loosening] Tightens guitar strings securely for stable tuning [Fast And Accurate Tuning] Enables quick and precise tuning of guitar strings [Effective Screw Prevention] 4mm gear prevents screws from slipping [Replace Old Tuning Pegs] Ideal for replacing old and dirty tuning pegs for improved guitar tuning