I am in the process of attempting to install an outside switch for a radon mitigation system. However, I am unable to drill through the remaining part of the block wall. I have an M12 Fuel hammer drill and a carbide drill bit. I imagine something is in the way but what? If it was concrete in the floor I would guess rebar. The first part went through like butter. I have pictures: https://imgur.com/a/hCed4u8
Rebar is used in hollow block wall too:
I’d remove one of those circular knockouts at the back of the wall box to drill an inch to the left or right.
Huh, the more you know. I’ll try that out tomorrow. Thanks