Bosch8X PRO Metal HSS-G Impact Twist Drill Bit Set (for Non-Ferrous Metals, Steel, Ø 2,0, 3,0, 4,0, 5,0, 6,0, 7,0, 8,0, 10,0 mm, Professional Accessory Impact Drill/Driver, Rotary Drill/Drivers)

Great quality drill and very sharp.I'm a sparky and go through drills like you wouldn't believe.The 5 mm lasted half a day before I had to sharpen it.

Drills appear to be well made, haven't had the opportunity to use on iron or steel so drilling properties still unknown.

They feel like they are really good drill bits. As I haven't used them to any degree they only get 3 for durability because I don't know yet. I would like a second set in +0.5 sizes. If they don't perform, I will revise my review. If they last particularly well I will revise my review.