Features 1,Accurate 1:21 Gear Ratio: The tuning key pegs machine head features an accurate 1:21 gear ratio, ensuring slick and accurate tuning adjustments for your guitar. The gear ratio is optimized for modern 10mm spindle holes, providing reliable performance and stability during tuning. 2,Comfortable: The tuning key pegs machine heads replacement is designed for comfort and ease of use, allowing for comfortable adjustment of string tension. The round knob with sealed housing and 45 degree fixed tab provides a user friendly interface for quick and accurate tuning adjustments. 3,Easy Installation: The locking tuning key peg comes complete with installation hardware, including screws, bushings, and washers, for easy and convenient installation on your guitar. This ensures an easy setup process, allowing you to start tuning your instrument right away. 4,Heavy Duty Internal Gears: The guitar locking tuning key peg features heavy duty internal gears that provide secure locking and convenient tuning. It is easy to install and can be used to replace old or dirty guitar tuning pegs, ensuring reliable performance and enhanced tuning capabilities for your instrument. 5,Sealed Lubrication: The guitar lock string tuner is equipped with sealed lubrication for effortless tuning and maintenance. The combination of a cast housing and metal knob ensures durability and longevity, withstanding regular use and tuning adjustments without compromising performance. Specification Item Type: Guitar Locking Tuner Material: Alloy Steel Gear Ratio 1:21 Function: The knob on the back can lock the strings, delicate feel, accurate tuning, more stable. Package List 6 x Guitar Locking Tuners (3R3L) 6 x Screws6 x Nuts6 x Spacers Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.