What are the size of the iTalk4 mounting holes and how far apart are they? February 11, 2021 18:13 Updated The thread size of the mounting holes are #6-32 and they are 2“ (51.7 mm) apart. Related articles What are the dimensions of the iTalk4? Mounting the iTalk4 How do I clear all messages off the iTalk4? Getting Started With iTalk4 Speech Device How do you use the iTalk2 with external switches?