I installed these to replace some termite damaged handrails. I went to Bunnings and got some Kanga masonry drill bits and they worked flawlessly drilling through concrete with a hammer drill on high torque / low speed (apply moderator force).
I also picked up some Dynabolt sleeved anchors (6mm) and used those instead of the included ones.
The Vevor ad says it can cover 3 steps and it's accurate. I managed to adapt it to cover 4 steps (but I would not recommend doing this and stick to 3 steps)
The handrails are great quality and look excellent for the price. I can see it lasting many years - now let's see how it holds up to weather/rain and humidity.