BLUEROCK 4" inch Pro Series Diamond Wet Core Drill Bit for Concrete, Rebar, Brick, Block, Masonry & Asphalt, 1-1/4" Thread

Cut through a 12in stem wall and rebar with no problem.

Buen producto

EDIT: Bluerock reached out to me and has offered to send a replacement bit via 2 day shipping which we have accepted. Hopefully the broken tooth was just a rare occurrence, the bit did seem to work well (and probably would still drill with a broken tooth but using it that way is not recommended). Thanks Bluerock for standing behind your product. Original review: I'm not sure what the expectation is of these bits but it worked ok, however after about a dozen cores in cured concrete sidewalks (about 4"-6" thick) I realized it was missing a tooth. I'm guessing it would still cut but everything I read said not to use them if a tooth is missing. We used plenty of water and drilled slowly without applying too much pressure so I'm not sure why this bit failed.

cores well keep alot of water on it and it should last a long time,but anything over a two inch core bit will break your wrist on a hand held coring drill or at least spin you head over heels if it binds or grabs anything it doesn't like

Work fine for our plumbing company. Moderate use. May now be the best for commercial coring company's but we have had good sucess with these bits so far.

Core bit worked great, used on old hard concrete and had no problems.

Pleasantly surprised. Third new orders

Worked perfectly. Went through 6 inches of concrete and rebar in about one minute. Bought six more bits in different sizes by the same manufacturer.