Review on Irwin Tools 4935444 Speedhammer Masonry by Nick Gibson

As a result of using this product I found that it was completely ineffective when drilling INTO concrete... i had to keep replacing the bits after only a few uses, which was incredibly frustrating. The only positive was that they were relatively cheap. However, the quality was so poor that I ended up spending more in the long run on replacements. I would not recommend these to anyone in the Industrial and Scientific field..