What size hex wrench?

[Brlong23]

what size hex wrench do I need to open the JB4 box to plug the WiFi portion in?

 

[Bonsai]

It’s a 7/64 hex. I didn’t have one and I was able to use a T15 I believe and tap in tight enough to unscrew them. But if you have time and not in a rush can find a set with a 7/64 at any hardware store or harbor freight.