I don't usually write product reviews but I found it really important to write because these anchors were just awful. I used a 5/8" masonry bit to drill the holes and when I tried to tighten the anchor on all but two the bolt began to turn in the hole. You can't pull the anchor out once it's inserted, but it rotates freely in the hole, not tighter. Therefore, the anchors did not work at all. I do not recommend these anchors.