Piano Tuner Spanner, Professional L-shape Piano Guzheng Tuning Wrench [Application]: Ideal piano tuning kit for apprentices, students, teachers, trainers, professional piano tuners, or anyone who wants to learn piano tuning [Function]: Specially designed for tuning guzheng and most machine devices that have quadrilateral openings [Easy to Use]: Small and exquisite, convenient to carry it,L-shape design, easy to use it [Material]: Made of quality stainless steel and plastic; L-shape design determines that it is convenient for use Color: dark wood Size: 16*3.8*2cm The size of the square mouth of the wrench is: 6*6mm Quantity delivered: 1 piece Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.