Solid sleeve anchors that provide a good hold.I installed two of these in cinder block wall (in the area of the block sidewalls and mortar and they held well. I drilled a 1/2" diameter hole and the fit was a bit tight, I would recommend a 9/16" bit, especially if you are screwing the bolt out more than an inch. I used these to secure an old 2x4 shelf bracket to the wall and they worked great.
by SteveVA