Bueyfolt 10 Packs 1/2 Inch Knurled Drop-in-Anchor for Solid Concrete, Premium Zinc Plated Carbon Steel Drop in Anchors Assortment, Internal Forced Expansion Screw Bolts

3/8 inch drill bit for 1/4 anchors. I found Dewalt masonry bit did the job after breaking a lesser bit. Buy the set tool unless you’re sure you have punch that will work. I used Grade 8 bolts in mine after snapping off an old softer one from my stash. As others have pointed out don’t over torque with a battery tool. Socket set was the order of the day for me.

Hope they work as good as they look!

Very pleased with these anchors!I got these for anchoring heavy shelving units into an old concrete basement floor.I've never worked with concrete this hard before! Even using diamond bits, the ability to dril down to a consistent depth has been a real challenge.These drop anchors have been a real life-saver, allowing me to use the longest bold length possible, at varying depths.Problem solved!

These are like most drop in anchors, these are fit perfect. Was able to drop in hole and knock into place. Bolt screws in correctly and holds as expected. Good product

Well designed, built and delivered. This type of concrete fastener does it's intended job very well, and these are very good fasteners.

Durable, strong, fits well and fasten things especially posts well and easily.Very light easy to use, uses a 3/8 bolts. Portable, easy to carry in your pockets while installing. All you need is a drill, hammer bolt and you're ready to fasten.Bolts expands the end of the expansion when screwed all the way to bottom. Holds well and very good to use and secure structures to the cement.