Archer PRO 2-1/2” in. Diamond Turbo Core Drill Bit/Hole Saw for Concrete Drilling and Masonry. 14” Drill Depth, 1-1/4” in. -7 Arbor for Core Drill Stand Rig, Dry and Wet Use

muy recomendable

This core drill bit worked great for my application, installation of a mini split AC system. I had to drill through several walls, which all consisting of concrete and stucco over adobe walls. I also had to drill through sandstone and it worked great there as well. It makes a clean entrance and exit despite the hard yet brittle materials. The only note that I have, when renting the drill from a local rental store, Home Depot in my case, I needed an adapter. Since Home Depot didn’t provide this, I had to purchase that separately. Also realize that if you are renting a drill, you will want to know the insertion end. BI to BS in my case, using a Hilti DD-150-U. My expense came out to be half the price when compared to purchasing a drill that was a direct connection to the drill.

Coring through one course of brick and 8 inches of concrete, this bit couldn't even complete a single hole before losing all of its teeth. The bit I bought this one to replace cored 36 holes through the same material.

Definitely worth the price. If you charge by the breach, it makes its money back on the first hole. It's a very aggressive cutter and wants to jump when you start. Start your boring drill at full speed and do your best to have drill on a platform with a guide or stopper on the right side. (This is if you're not using a mount) Once it gets started, it shreds through cinder and cement block with ease and no blow out on the outside of the breach. It goes through solid concrete far better than our wet bit . Naturally, you will have quite a bit of dust during dry coring. A shop vac held close cures that headache. We've probably got about a dozen and a half breaches completed in solid concrete, 16" granite and cinderblock. If it burns up anytime soon, it has definitely made it money back twenty fold between billing and labor saving.

This did the job I needed it to. Bored through 8" block (poured solid) to run a 4" drain line out of a basement. I would be nice to have a holes in the top to be able to drive the concrete slug from the bit, but at this price point it really can't be beat.