Wensilon(20 pcs) 5/8"-11 Premium Stainless Steel Drop in Anchors Assortment, Knurled Drop-in-Anchor for Solid Concrete, Internal Forced Expansion Screw Bolts

Worked great. In hindsight I would have bought longer ones. I torx head screw driver works better than the tool they sell to set them. Buy the arrow head concrete bits and everything will work perfectly.

These were just what the doctor ordered. I needed to install a tent on my driveway and didn't want the tent to blow over with the wind. On dirt, I would have hammered some steaks in, but on concrete, I didn't want to use Tapcon Concrete Screws. I wanted something I could put in and take out without continually making holes in the concrete or worse, breaking it up. These went in great. Drilled, dropped them in and then screwed the included machine screw and they held the tent up under heavy winds. Perfect for the application!.

I purchased the Stainless Steel and installed two behind a water spigot whose hole was drilled too large by the person who installed it. A little PC concrete plus these anchors seem as hard as the brick I attached them to. I bought a couple of stainless steel screws locally and now my water spigot is held firmly to the brick, but I can still remove it within seconds if needed in the future. Great product! To install these easily, you needed a drop-in anchor setting tool. I didn't realize this until after I received them, so I had to delay my project a few days while I ordered and waited for the tool to be delivered. I highly recommend you guys sell a package of these with the tool, too! It would only cost a few more dollars and allow a new customer to get everything they need at once.

Worked very well in in both concrete and stucco. Do make sure you use a 5/16" drill bit instead of the 3/8" recommended. Also, don't drill too deep or you will have a harder time "setting" the anchor in place using their tool.

I needed to secure a hurricane bracket for my garage door and used these to screw the support to the cement floor. I used a 5/16” masonry bit and purchased a setting tool. When I remove the brace I simply put the screws back in and wait for the next hurricane. All eight set and worked perfectly.

These are nicely machined and I would have normally given them 5 stars except for the fact that the barrel bodies are undersized. Most 1/4"-20 anchors are 3/8" in diameter and you would bore a 3/8" hole to install them into. However these are closer to 5/16" in diameter but yet they still recommend you bore a 3/8" hole -- which is what I did. Big mistake. Unless you are lucky, you'll find like I did, that tightening a bolt into these anchors more than likely will result in the anchor just spinning around and not locking into the hole. Instead you need to bore a 5/16" hole that you'll drop the anchor into. However the setting tool to lock these anchors is 3/8" inches wide so you'll then have to re-bore the hole down to the depth of the top of the anchor to 3/8" in order to set the anchor. Big pain in the butt.

They work like they are supposed to

These might be good in concrete floors, but not cinder block applications. It requires a tool to drive the insert wedge to expand the flange that should bite into the concrete. But driving it into cinder blocks pushes it in too far and fails. Once installed flush, there is only a 1/2" thread available for installing a fastener, which is not enough in most cases. I trashed them since I could not get them to anchor properly.