I have tried to hang a curtain with some wall plugs over some balcony doors, but whereever I drill in to the wall, I seem to hit a steel plate (metal girder?). This only allows me to drill in approx. 1/2 inch.
The wall plugs for the curtain are at least 2/3 inches long, and the curtain and poll is likely to be heavy.
Is there any way of drilling in to the girder (have tried with metal bits) or a work around?