Not sure if ceiling anchor is the correct term, so I attached a picture for reference.
I removed the drop ceiling from my basement, the metal frame holding the tiles were screwed into these wholes (anchors?), so I have quite a few across my concrete ceiling (roughly 1-1.5 meters apart from each other).
My question is, how much weight can these anchors support? They are about 2 cm deep and 9 mm wide. I am thinking of installing a hammock / pull up bar / perhaps use it to support a small bouldering wall if possible.
Any answer is highly appreciated!