Unfortunately, I can recommend the product under certain conditions. In Gibswänden no problems but the place is indeed no great challenge. In KS masonry only conditionally recommended. It is indeed but takes a long time. In reinforced concrete no chance not to use it. For the price you probably can not even expect. So if you take has to make a hole in KS to use. But you should have to make a lot of holes then better buy something else. It is the time you have. There remains the question how durable the Crown is that I can not say at present. But if I made another 10 holes in KS it will be the have been like. Addendum: The crown was no longer usable after approximately 25 holes in KS. I have then a crown commercially worried for 89.00. OK not cheap but what can I say after about 60 holes in the crown KS works still perfectly. Also reinforced concrete can be drilled as long as one does not come on iron.
