Simpson Strong-Tie THDB62600H4SS Titen HD 5/8 in. x 6 in. Type 304 Stainless-Steel Heavy-Duty Screw Anchor (10-Qty)

I used these to hold down ABU46 post bases to my patio for a small freestanding deck. Probably overkill but I know the deck isn’t going anywhere with these holding it down.

I've been considering buying these vs the expanding anchors for attaching post bases to the concrete, and ended up choosing these because they don't put pressure from inside onto the walls. I'm very happy that I did. The connection is very strong and the you can feel how the first 2-3 grooves on the screw are of different material made to cut through the concreate as they make way for the other grooves to go through.