Watch Case Back Opener for Panerai 15-sided Polygon Repair Tool Remover. Fit for Panerai Watch Case Back. 40: The inner diameter of the case back notch is 36.44mm. 44: The inner diameter of the case back notch is 40.01mm. 45: The inner diameter of the case back notch is 43.68mm. 47: The inner diameter of…