Description: Trumpet buttons 3 per Musical instrument trumpet button snap piston buckle Brass instrument key accessories button cover It screws diameter is about 3.85mm. Very beautiful, and it can fit most brands of the trumpet. Fit for many models of trumpet finger button replacement and repairing. Package Includes: 3 Pieces Trumpet Finger ButtonsDescription: Trumpet buttons 3 per Musical instrument trumpet button snap piston buckle Brass instrument key accessories button cover It screws diameter is about 3.85mm. Very beautiful, and it can fit most brands of the trumpet. Fit for many models of trumpet finger button replacement and repairing. Package Includes: 3 Pieces Trumpet Finger Buttons