Review on ⚡ Copper Stainless Drill Speed Cutting - Optimize Your Drilling Efficiency! by Ryan Nguyen

This is a joke and not even funny, it is written that it can cut up to 3mm but as you can see from the photos it was immediately afterwards blunt 2 and 1/2 cuts, even with a 3-minute break, see tooth comparison in the second picture. This is only suitable for thin sheet metal.