Pros:- 10 sizes- Good heavy duty steel bits with black protective electroplating- Tungsten carbide cutting tips- Fairly long shanks- Seems to cut through concrete well, at least when new- Made for 1/4" hex drive chucks, so useful with most battery powered drills and screwdrivers as well as regular drill chucks Cons: - Electroplated black finish will wear off on first use - Packaging is destructive so no place to store bits once opened - Long shank makes small bits more brittle Use of impact should concrete or masonry drill bits never last so it will be interesting to see how they hold up also took off the electroplating which is not surprising however generally I will predict I'd say they hold up like the cheapest bits. According to my magnet test they have carbide tips, I wish the packaging had to do with the pub don't break into them, otherwise a bunch of little things will rattle in your tool box. At least give us a cheap plastic holder! I guess I just put them in a ziplock bag or something. Considering the price and my first use test I give these bits 5 stars.