The 3'x3' awning came with assembly instructions, but no installation instructions. The awning came with screws and set screws (for concrete).  I have wood siding.  I assumed I would need lag bolts (which I bought separately) instead of the set screws. In searching McCombo website, I found a youtube amateur instruction video.  I learned what to do with the screws (which are part of the assembly, but no indication on the instruction sheet).  The video did not tell the drill bit size.  Again, I searched the website for a phone number.  The MCombo employee answering the customer service number referred me to another number.  Asking him about the drill bit size and other assembly questions, he said someone would call me back.  I am still waiting.