Features: Designed for precise hole punching, enhancing the soundboard's resonance and tuning accuracy. Ergonomically designed for comfortable handling, making tuning more efficient. Knurled surfaces provides better grip when driving loose or new tuning pins. Made from Alloy materials, ensuring durability and longevity for professional use. Great for beginners, this tool simplifies process of tuning and learning piano. Specifications: Materials: Alloy Style: Half open shaft punch/Closed shaft punch Length: about 10.3cm/4.06inch Bottom diameter: about 16mm/0.63inch Top diameter: about 12mm/0.47inch Package Includes: 1pc Piano Tuning Pin note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.