Can i drill into a metal lintel in order to fit a curtain pole?

Question

I want to hang curtains at double french doors. I have drilled a little hole with a masonary bit but it won't go in the wall very far. Sounds like i'm hitting metal so i suspect there is a lintle over the doors. If i drill through the lintle with metal drill bits will it weaken the lintle. It is only one little hole, at the other side i seem to be able to manage with a masonary bit.

Answer 1

shouldnt be enough to matter. a big hole, yeah but up to a quarter inch or so, no problem.