Tuning Hammer (Wood Grain Color/Total Length 16cm/1 Piece) L-shaped Hammer Wrench Piano Tuning Wrench Koto Piano Tuning Tool Adjust Piano Tone Metronome Tuning Kit Musical Instrument Repair Tool Small and Lightweight, Easy to Carry, Easy to Use, Durable 【Size】Total length approx. 16cm, handle length approx. 10.5cm, inner hole diameter approx. 0.65cm, weight approx. 78g 【High-Quality Materials】Resin handle tuning wrench, fine workmanship, clear wood grain, glossy surface, beautiful and gentle appearance, comfortable, long-lasting, and good to the touch. 【Durability】Uses high-quality steel metal; avoids magnetism, prevents thread slippage, has high rust resistance, is strong, durable, and long-lasting. 【Features】Koto tuning and string replacement; has a classical feel alongside the koto; small and lightweight, easy to carry, and easy to use. 【Uses】Koto inner square spanner, suitable for most koto shafts.