Not happy with these screws, tried the first one and after opening up the hole the screws slipped, did not grip to the cement. Used regular concrete anchor and screws. Would not buy again.
Pros
These were really easy to use and worked great.
Cons
Yasorn 5-Pack Stainless Steel M8X60Mm Expansion Bolts With External Hex are not suitable for use on certain materials, like brick or concrete