3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (10 pcs)

3/8" x 5" I made certain to run my bit in and out several times to ensure hole diameter, then air to blow out. 18v battery impact gun had no problem installing to hold down 1-1/2" bottom plate of walls on slab concrete. Used 20 with no failures. These are described as 13 grade with similar pullout to redheads of the same size, however, redheads (Tapcon) are rated 9 grade. 9 grade will have less torque strength but better shear. If weight is at max load for your fasteners and shear is your concern (such as wall mounted) you may want to consider the lesser grade. Otherwise upgrade to next size. I am purchasing another 60 today. Absolutely works for my install.

These are large and seem very strong / long lasting. The included nut driver for your 20v impact driver makes installation SO much easier. Seem to hold well in any concrete substrate!

I used FIVE of these bad boys to mount a basement "dunk ball" hoop. I would've used six except I was an idiot and used the wrong drill bit size on one hole. Once I had the hoop mounted, I grabbed ahold of the base of the rim and did some pull ups. I weigh 165 pounds and it held me with no movement or anything. Buy these.

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.

No issues once installed correctly, we installed four of these to our scissor car lift in the garage instead of supplier's provided anchors that are just too painful to install.

Don’t use a 1/2” masonry drill bit with these they will not hold as they are not 1/2 “ they will not hold. Sent back and went with Simpson

Fast shipping, good price and they worked perfectly as they should. Used them on my garage 4 post car lift.

Used to secure stud wall to concrete