As the heading suggests, I'm trying to mount numbers on my letter box without much success. I placed masking tape over the front to stop the drill from running off. But the drill wouldn't drill through it. I assumed it was plastic/perspex. Looks like it might be glass.
Any suggestions?. I'm not game enough to use the hammer setting on the drill for fear of cracking the glass. Surely they'd be an easy way to mount some numbers?