2 Pack Tuning Slide Stop Screws for Bach Stradivarius Trumpet 1st & 3rd Valve Slide, Stainless Steel Rod Nuts 180/190 Series, Precision Smooth Performance

【Pro-grade Stainless Steel for Durability 】:Precision-machined from corrosion-resistant stainless steel with smooth nickel plating to match with Bach finish. Resists degradation from valve oil, slide grease, and humidity 【Universal Compatibility with Modern for Bach Stradivarius Models】:Engineered to exact 4-40 UNC thread specifications for seamless fit for Bach 180S, 180ML, 37, 43, LR180, and all post-1980 Stradivarius trumpets. NOT COMPATIBLE with vintage Benge or pre-1970s for Bach instruments 【Tool-free Installation with Performer-friendly Design】:Knurled grip surfaces on trigger nuts enable secure hand-tightening during rehearsals or backstage emergencies – no screwdrivers required. Left-hand thread on 3rd valve nuts prevents loosening from natural playing vibration 【Precision Tuning & Stable Performance】: Designed to lock tuning slides and valve slides in place, preventing unwanted movement during play. Eliminates pitch drift, ensures consistent intonation (especially for low-register notes), and restores smooth slide action for effortless playing. 【Professional-grade Reliability for Studio & Stage】:Trusted by orchestral musicians and touring professionals to prevent catastrophic slide failures during performances. Each component undergoes triple quality inspection to ensure zero thread defects.