Keyboard Accessories -Piano Felt Railing Perforations Keyboard Instrument Adjusting Tuning Instrument Highlights generic brand Piano Felt Railing Perforations Keyboard Instrument Adjusting Instrument Tuning Description: Piano balance front rail wool felt punching regulating tool Leveling the keys and adjusting the distance traveled when pressed Perfect piano accessory for pianist Easy to install, convenient to use Material: 45 steel Size chart: L: approx. 10.5cm/4.13inch Diameter: approx. 2.3 cm / 0.91 inch Package includes: 1x piano tuning tool Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item Due to the measurement manual, there may be 1-2mm error