High Hardness 1.5mm-10.0mm Hex Shank Cobalt Twist Drill Drilling Tools Twist Drill Bit Drill Bit

I drilled a 4*25 steel strip for grounding (PE busbar) with a 7mm drill to secure it to the wall with a 6mm anchor. The drill became dull and stopped drilling before I had drilled even 30 holes.

I was taken in by the promised strength of the drill and got caught. It didn't drill metal, but 1 cm of the drill broke off. Now I'm thinking whether to buy another one or not.