I recently tested a twisted drilling electric bit from Uxcell in the industrial drill bits category. As a result of my tests, I determined that this drill bit is exceptional in drilling through tough materials including metals and wood. The twisted design allows for faster and easier drilling. The only drawback is that it may not be suitable for delicate tasks as it is designed for heavy-duty jobs. Overall, I recommend this drill bit for any tough drilling project.
Pros
Efficient at drilling holes with precision and consistency
At 1mm these are very small drills. We've only used them to drill a lot of holes in PVC so they worked great in that material. We only broke two. I don't know how they will perform on harder material. Maybe that's one of the reasons you need to buy 20. :)
I took a chance with these drills on the grounds that they couldn't be that bad and I couldn't be more wrong. The first few chisels I tested had off-center blades and no cutting face at all. The only benefit of these bits is that the amount you get in a pack leaves you with a decent few.