Features 1,[Highquality Guitar Tuning Peg Knobs]: These 6 pieces of tuning peg knobs are designed to provide optimal tuning control for your guitar. Crafted with precision and polished for a sleek appearance, they offer both functionality and aesthetics. 2,[Easy Installation and Convenience]: With their userfriendly design, these guitar tuner knobs can be easily installed on acoustic, electric, or folk guitars. The installation hole size measures approximately (L x W) 3.8MM4MM, ensuring compatibility with a wide range of instruments. 3,[Zinc Alloy Construction]: Made from lightweight yet sturdy zinc alloy, these tuning peg knobs are built to last. They can withstand the rigors of daily use and offer longlasting performance, allowing you to enjoy seamless tuning for your guitar. 4,[Complete Set with Accessories]: Each set comes with 6 installation screws and 6 plastic washers, as well as 6 metal washers. These additional accessories ensure a secure and stable fit, providing peace of mind while playing your guitar. 5,[Versatile and Reliable]: Whether you're a professional musician or an amateur enthusiast, these guitar tuning pegs are an essential accessory for any guitar player. They offer reliable tuning control, allowing you to achieve the perfect pitch for your instrument every time. Upgrade your guitar with these highquality tuner knobs and elevate your playing experience. Specification Material: Zinc alloy Color: Black, Gold, Silver (Optional) Compatible Instrument: For acoustic guitar, eletric guitar, folk guitar Installation Hole Dimension: Approx. 3.8mm4mm Item Size: 27.6 x 16.8mm or 1.1 x 0.7inch   Package List 6 x Guitar Tuning Peg Knobsbr or 6 x Screwbr or 6 x Metal Rubber Ringbr or 6 x Plastic Rubber Ring 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.