They are made of Zinc Yellow Passivated Finish.
Will they rust, if the coating is damaged yes, if not eventual they are bound to. How depends on conditions.
You might get some surface rust, especially if you scratch the head while putting them in (less likely with torx) but not enough to do any structural damage, just aesthetic.
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