I bought this to drill a hole through 400mm of reinforced concrete.Once the water feed was sorted, it drilled the hole with little effort in about 20 minutes.I used some M10 expanding bolts as I was drilling horizontally.The secret is not to push too hard, forcing the drill only results in it being overloaded.If you’re using it professionally you’ll probably want a more heavy duty machine, I have a further 6 holes to drill and I’ll add to the review after I’ve done that