What are the differences between self-tapping screws and self-drilling screws, and which one is more suitable for a specific application?

I’ve used both — self-tapping screws make their own threads, while self-drilling ones can drill and tap at the same time. If you’re working with metal and want to save time, self-drilling is better. For plastic or wood, self-tapping is fine. We often use EJOT Octaqon’s screws on-site — they’re precise, sharp, and easy to work with.