Why can't I drill into my window frame? My walls are concrete block, but it seems like I hit steel about a 1/2 inch in. I am using a cobalt bit. -
![interior - What is my drill hitting and not penetrating when I hang curtains? - Home Improvement Stack Exchange interior - What is my drill hitting and not penetrating when I hang curtains? - Home Improvement Stack Exchange](https://i.stack.imgur.com/vIsB4.jpg)
interior - What is my drill hitting and not penetrating when I hang curtains? - Home Improvement Stack Exchange
What did I drill into? It sounded like I drilled into a metal sheet (1 inch wide based on pilot holes) in an interior wall of a new apartment complex. There doesn't
![How to Install a Window Air Conditioner in a Vinyl Replacement Window with Vinyl Siding - MassLandlords.net How to Install a Window Air Conditioner in a Vinyl Replacement Window with Vinyl Siding - MassLandlords.net](https://masslandlords.net/wp-content/uploads/how-to-install-a-window-air-conditioner-the-problem-with-vinyl-windows-air-sealing-lips-wide.jpg)
How to Install a Window Air Conditioner in a Vinyl Replacement Window with Vinyl Siding - MassLandlords.net
![drill - Trouble drilling into outside facing wall above window to hang curtain rod - Home Improvement Stack Exchange drill - Trouble drilling into outside facing wall above window to hang curtain rod - Home Improvement Stack Exchange](https://i.stack.imgur.com/5NaeU.jpg)
drill - Trouble drilling into outside facing wall above window to hang curtain rod - Home Improvement Stack Exchange
![Installing window unit in aluminum frame window - how to secure? - DoItYourself.com Community Forums Installing window unit in aluminum frame window - how to secure? - DoItYourself.com Community Forums](http://i.imgur.com/B80Dlui.jpg)