Features:_x000D_ 1. Made of high quality iron material, sturdy and durable, ensure a long time use._x000D_ 2. Makes the tuned guitar string does not loosen easily._x000D_ 3. With these tuning peg gears, you can tune guitar strings fast and accurately._x000D_ 4. High quality 4mm gear, it's effective to prevent screw slippage._x000D_ 5. Ideal to replace your old and dirty tuning pegs and great for guitar tuning._x000D_ _x000D_ Specifications:_x000D_ Material: Iron_x000D_ Hole: 4mm_x000D_ The Gear Ratio 1:18_x000D_ _x000D_ Package list: _x000D_ 6 * Gear 1Made of high quality iron material, sturdy and durable, ensure a long time use. 2Makes the tuned guitar string does not loosen easily. 3With these tuning peg gears, you can tune guitar strings fast and accurately. 4High quality 4mm gear, it's effective to prevent screw slippage. 5Ideal to replace your old and dirty tuning pegs and great for guitar tuning.