CONFAST 1/4" (6.35mm) x 2-1/4" (57.15mm) Hex Head Concrete Screw Anchor with Drill Bit for Anchoring to Masonry, Block, Brick (100 per Box)

As long as you are careful choosing the correct drill, then these screws are superior to screw and plug.

The screws themselves are decent - they hold pretty well and tap in fairly easily. The large socket head makes them easy to drive, although would need to be counter sunk manually if you don’t want them to stand proud However the included bit is utterly useless - mine twisted ridiculously when halfway through the first hole I tried to drill, and the concrete I was fixing into was not even particularly hard! Fortunately I had another bit of the same size, and could continue with that... If you buy this, I recommend also buying another high quality bit

bought two different sizes of these to fasten into breezeblocks. Neither size would take a hold, ended up having to raw plug and use screws.

Great product excellent service

Used two boxes of these to put up some stud walls. Bottom studs are going into concrete floors and these fixed well and not had a single one break or snap, great for fixing 2x4 to the floor with DPC sheeting underneath. Coating should stop erosion but it’ll be a while before we find out!