Service: We are very sorry for the shopping experience you have experienced. If you have any problems with the goods you received, please contact us and we will serve you 24 hours a day. 7-Piece Piano Regulation Kit: This grand piano action tool set comes with 1 handle and 6 professional replacement tips. Perfectly designed to adjust grand piano hammers, levers and dampers for standard piano regulation work Premium Construction: Adopts high-strength metal tool heads for sturdy wear-resistant performance. The grip handle offers stable holding and comfortable operate, ensuring safe and accurate fine-tuning every time for Grand Piano Maintenance: Specially made for grand piano action repair and regulation. Helps technicians calibrate hammer striking angle and key sensitivity, keeping your piano with sensitive response and stable performance Must-Have Professional Tool: for professional piano technicians, repair workers and music enthusiasts. Delivers high precision for daily piano maintenance, tuning and restoration, a practical addition to your instrument repair kit