Lackmond PRM Series Dry Masonry Drill Bit - 3" Stone/Masonry Hole Saw with Diamond Segments for Fast Drilling & 5/8"-11 Thread Arbor - DCB3PRM

I wasn't impressed at all with this core bit. It was difficult to start and the bit was actually worn out before drilling through a brick. I kept speeds moderate but drill still burned up. I am going to attempt a return to Amazon.

Great Product and Fast Shipping

lackmond is the best name in diamonds product is well built and looks great. Too bad I did not read it has a 5/8" thread ...I needed the big rig thread so it just sits in the box. I meant to return but took too long:(

This core bit drilled about 20 holes in three inch thick cultured stone caps and was drilling just as good on the last one as the first one. We had to build a plywood double jig to hold it steady, as it is so long, but it did the job well.