Stainless Steel M8 Expansion Hook - 5pcs for Wall & Brick Anchoring

I installed these into cinder blocks to anchor my shade sail several weeks ago and they haven't budged since installation. My only issue is that I drilled the holes for the anchors to the same depth and one of the anchors set itself deeper than I would have liked. Overall, they performed exactly as needed.The diameter of this item does not match any standard drill bit. So, when I attempted to use it in concrete, there was slop. I could not go a size smaller on the drill bit. I tried. No amount of hammering would get it in. The only standard sized bit that would allow it to go in, resulted in slop in the hole. That said, it is appearing to hold a very, very heavy mirror (probably about 200 pounds, I used two, one on each corner) but it is not snug as it should be. It is angled down, under the weight of the mirror. I would post a picture but it is at a second home and i did not take one. I will try to update later.Fairly simple and straightforward to use. Drill a hole (already have a hammer drill for concrete), stick in the bolt and tighten until it becomes snug. Using these to help anchor a solar sail down. So far so good.Really good quality. Worked perfect for me.Came exactly as described. Just what I needed.Really sturdy. Good buy.These are used in a block wall and they work perfect. Drilled hole with concrete bit and tapped in gently with hammer then tightened the nut and screwed on the eye. The install is for a 8x12 patio sail cloth sun cover that is stretched very tight and it looks great with no sags. It’s been up for over a week and everyone who sees it is impressed. I will buy these again when needed.