Check the listing for details. Guitar Tuner Conversion Bushing Adapter Ferrules Conversion Zinc Alloy Gold Tone. Condition: New. Listed at 9.68 USD. What is this?This guitar tuner bushing is a common tool for guitar repairers. It can be used to install vintage tuning keys on modern tuner holes, as well as to replace old and dirty nuts.What will I get?The guitar tuning peg button is in size of: Overall Height: 9mm / 0.35 inch; Outer Diameter: 12mm / 0.47 inch.In the package of 6Pcs × Conversion BushingsAre there any advantages of the product?Made of aluminum alloy, it is strong and durable to ensure long-term use. The retro style semi-closed guitar tuner makes the guitar even more unique.How to use it?Align the hole of the tuning key with the tuning rod, then turn it clockwise and tighten it.What should I notice?Please check the diameter size of the tuner stem before purchasing!.