It didn't thread fully into the standard hole saw arbor (2nd photo) Did it about halfway and it jammed like the thread pitch was broken. . Place it in a vise and secure with a wrench. Donated for this spike, no big deal. Start very slowly and at an angle until you get a groove, then straighten up. Worked well and was 1/3 cheaper than Lowe's and HD. The granite bar was left in the warehouse so I'll either have to figure out how to knock it out or it's done. If I need to make more than one holeโฆ