Effective Portable Piano Tuning Hammer - Lightweight and comfortable. The L-shape design makes it easy to use and convenient to carry. Well made with an exact gauge to tune your piano without damaging the instrument. Fits Most Pianos - This L-shaped piano tuning wrench handle with nickel-plated metal shaft fits standard 3/16" coupler pins. The tuning hammer hole size is about 1/4". They can work with most piano uprights quite well. Save time - If you are a piano lover. Do you often have trouble getting started on a grand piano? These L-shaped piano wrenches can definitely help you. Help simplify all steps. Save your precious time. L-Shaped Design - The L-shaped design of the piano tuning key tuner is more in line with artificial body science. It's more convenient to hold. Does not cause hand pain from prolonged holding. High quality and durable material - The metal shaft of the L shape piano tuning key is made of hard steel. Abrasion resistance, small and exquisite, convenient to carry. Durable enough for long time use. NOTE 1. The size of the product is measured manually, and there will be an error of 2-3mm due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products