They were toolstation Abracs bits, the lighter one is ALDI. Both snapped within seconds.
Either way... I found out majority of hole locations didn't actually hit steel... only 3 holes of the 18 total had steel and all I had to do was to either use the middle hole in the joist hanger instead of the lower one or angle the drill bit up or down slightly to miss the steel.
Told the owner if wind does wobble the installation I'll just come back and install hurricane straps underneath each joist.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local