2 of 3 people found the following review helpful
They last, they work as claimed,
This review is from: Bosch 5/5.5/6/6/7/8/10 mm Multi-Construction Drill Bits (7-Piece) (DIY & Tools)
I've used them on aluminium, galvanised steel and ordinary bits of steel, brick, concrete, plastic and wood.
I've not worn them out yet, had them two years and used them frequently when building my workshop and other projects.
I'll be buying more when I eventually need them!