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 Getting Started With iTalk2 Speech Device Getting Started With iTalk4 Speech Device Getting Started With Blue2 Bluetooth Switch