APPLICATION: Used for tuning pianos, guzhengs, and other instruments with a quadrilateral opening. L-SHAPE DESIGN: L-shape design simplifies tone adjustment. NON-SLIP HANDLE: Small and compact with a sturdy, smooth handle. Non-slip surface ensures comfortable grip and handling. MATERIAL: Stainless steel key with a high-quality handle for long-lasting durability. COST-EFFICIENT: Helps save on professional tuning expenses; a practical accessory for regular tuning needs. PRODUCT FEATURES: Compact and well-built handle with smooth, non-slip finish for comfortable use. Suitable for piano, guzheng, and other instruments requiring a quadrilateral tuning key. L-shaped design allows efficient and effective tone adjustment. SPECIFICATIONS: Condition: New Material: Stainless Steel, Plastic Color: As shown Internal Bore Diameter: Approx. 0.65 cm / 0.26 inch Total Length: Approx. 16.5 cm / 6.5 inches Handle Length: Approx. 11 cm / 4.3 inches Weight: Approx. 77 g NOTE: Please measure your instrument’s pin size before purchase to ensure compatibility with the key’s quadrilateral opening.