Efficient Portable Piano Tuner - Lightweight and comfortable. The L-shaped design makes it easy to use and convenient to carry. Well made with precise force to tune your piano without damaging the instrument. Suitable for most upright pianos - This L-shaped tuner key with nickel-plated metal handle fits standard 3/16" pins. The tuning hammer hole size is approximately 0.65 x 0.26 inches. It works well on most piano tuning pins. Save time - For piano enthusiasts who want a simpler tuning process, this tool helps streamline the steps and saves time. L-shaped design - The L-shaped tuning hammer is designed for ergonomic handling, providing a comfortable grip and reducing hand fatigue during extended use. Premium and durable material - The tuning key features a hardened steel shaft, resistant to abrasion. Compact and well-crafted for reliable long-term use.