Merriway BH03045 Self Tapping Concrete/ Masonry Bolt M8 x 60 -10 Pcs

Great stuff. They're a fraction of the cost and easier to use than expansion bolts. I simply drilled an 8mm hole into concrete then screwed the bolt into it using a ratchet wrench.

These little bolts are fantastic really strong

Used to fix a fence post bracket into concrete, they hold really well and I used an adjustable wrench to tighten them easily.