Efficient Portable Piano Tuner - Lightweight and Comfortable. The L-shaped design makes it easy to use and convenient to carry. Well made with exact strength to tune your piano without damaging the instrument. Save your valuable time - If you are a piano lover. Do you often have trouble getting started with a grand piano These L-shaped piano keys can definitely help you. Helps you to simplify all the steps. Save your precious time. L-shaped design - The L-shaped design of the adjustment hammer is more in line with the science of artificial body. It is more comfortable to hold. Does not cause hand pain due to prolonged adhesion. Premium and Durable Material - The metal shaft of the tuning key is made of hard steel. Abrasion resistance, small and exquisite, convenient to carry it. Durable enough for long time use. Features: 3 Pack a Set Come with 3 tuning keys. Enough for your replacement in everyday life. Or you can also share with your friends. Convenient tuning hammer Specially designed for tuning guzheng and most small machines with quadrilateral openings. Lightweight and portable The key is a little shorter than the professional key, which will not affect the result of use, just need more force to use it. Note: Please measure the tip size of your device before purchasing, make sure your devices size matches the quadrilateral of the wrench. The package includes: 3 x square shaped piano tuner key