Drilling a dimple isn't rocket science, nor is it making a flawless cube with nothing but a file (as used to be introductory training for machinists in Germany).
Agree, but will add that a lot of consumer drill bits are total junk and won't work. I've had new cheap drill bits, with TiN coating!, that wouldn't drill a hole in unhardened A36 steel (that's common, cheap, soft steel for the non-technical).
OP: any quality bit for metal should work. The better quality bits sold at big box stores are OK, or you can order one from an industrial supplier like Bisco Tool (
http://www.biscotoolsupply.com/drill...-mm-drill-bits) or McMaster-Carr (
https://www.mcmaster.com/). You want at minimum a high-speed steel (HSS) bit, which is the lowest grade typically offered for drilling into metal. HSS coated with TiN is better IF the steel itself is good, but TiN is sometimes applied to junk bits for the consumer market, so it's no guarantee. If you're special ordering from one of those supply houses I would get a cobalt-steel bit. You don't need that level of hardness, but it will minimize the risk of having an issue drilling because of the hardness of the workpiece vs. the bit, and will stay sharp longer, and we're talking a dollar or two of added cost for one bit. As Todd K. said, you don't need a carbide bit, and you don't want one either because they are more likely to break on you if using a less-than-perfect setup.
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