Description Features: For acoustic guitar, electric guitar, electric bass. It can be used together with the electric winding machine and is convenient to use. Guitar string winder, which can be used to remove the guitar bridge pin. It is suitable for loosening and tightening the strings of the original/electric guitar or bass. It is made of high-quality plastic-material, which is wear-resistant and durable. It is an excellent auxiliary tool for a guitar players or guitarist. Specifications: Material: Plastic-material Hexagonal Diameter: 6mm/0.24inch Total Size: Approx. 2.4x6.5cm/0.94x2.56inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x String Winder Head Tool