1/4" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (30 pcs)

They gripped very strong, time will of course tell.

Very impressed with the concrete screws - they are stronger than I originally thought.

I used these to anchor down a large resin shed. They worked perfectly. I would buy again.

Time will tell, but I used these to replace some loose anchors in a rail installation and they seem very strong. So much easier to use than other anchor styles.

These are great anchors. I used them to mount cabinets to a concrete wall. I know those things will never fall. Very happy.

I decided to buy this bag of 30 fasteners because my project required 4-6 fasteners and the name-brand ones would have cost $18-$27. The shank measures slightly over 3/8" - not too much of a consequence though, because the hole in the fixture would need to be larger anyway, however I was unable to finish the installation by hand on two of the fasteners and had to use an air impact wrench.I installed these into concrete block using a 3/8" rotary hammer drill, and had to use my 3/4" impact wrench (rated at 1000 ft lbs) to drive the last two of these bolts all the way in. Perhaps a slightly larger hole would have made it easier, but I don't have anything to match the actual shank diameter. While this was a problem, it also speaks to the fasteners' strength. They held up to that force, and I am confident they will hold the fixture in place. The fixture is supporting a 66lb loudspeaker.

I purchased these to mount one of my bench grinder pedestals to the garage floor. I have used this type anchor before for standing walls and am fond of the ease or installation with my cordless impact, pus removal if needed later. The cosmetic appearance of these bolts are a little lacking, but they do work for my light duty needs. Price is fair compared the brand name.

These large concrete anchors work great and hold very well!!The key to this is cleaning the hole so the bolt goes in all the way. Bowling them out with a compressor or air tank works best.Good luck with your project!