Description This piano action nut set includesregulating insert nuts and piano action nut rod, designed for precise adjustment of grand piano action. The knurled knob nut and piano action nut clamp offer professional-grade control, ensuring every piano repair and tuning nut delivers enhanced performance in studio, concert, or classroom settings. Features -Color:Black -Material:Plastic, metal -Size:4.00X2.30X2.30cm/1.57X0.90X0.90in -Precise tuning experience: the piano action nut set delivers precise adjustment for your grand piano, ensuring every keystroke accurately conveys your musical emotion -Premium quality materials: the components provide exceptional durability, resisting daily wear to maintain playability over time -High compatibility: the piano action nut works with upright piano action nut and grand piano action nut, fitting various keyboard instrument action nut types for professionals and amateurs alike -Easy installation & adjustment: this accessory makes piano action nut replacement and tuning quick and convenient for technicians and enthusiasts -Prolevel performance: professional piano action nut hardware ensures optimal sound for teaching and performance, supported by genuine piano action nut parts that meet demanding music studios and education environmentsPackage list: 1 x grand piano accessories