APPLICATION: It is used for tuning piano, Guzheng and other instrument with the quadrilateral opening. L-SHAPE DESIGN: L-shape design simplifies tone adjustment. NON-SLIP HANDLE: Small and exquisite, sturdy and smooth handle. Non-slip for comfortable grip and handling. MATERIAL: Stainless steel key with high quality handle makes it durable to use for a long time. SAVING SILVER: It takes a large sum for professional tuning, tuning with this piano tuning key, it is a perfect accessory. Handle small and exquisite, sturdy and smooth. Non-slip for comfortable grip and handling. It is used for piano tuning, Guzheng and other instruments with quadrilateral opening. L-shaped design provides energy saving working for tone adjustment. Specification Condition: New Material: Stainless Steel, Plastic Color: as shown Internal Bore Diameter: Approx. 0.65cm / 0.26inch Total Length: Approx. 16.5 cm / 6.5 inch Handle Length: Approx. 11cm / 4.3inch Weight: Approx. 77g Note: Please measure your device tip size before purchasing, make sure your devices size match with the quadrangle of the key.