I will be "had" more or less resort to this system had to 10cm insulation "overcome". The description is good. Just as indicated drill, then milling the anchor, I absolutely empgfehle to use the supplied metal attachments. Clean borehole cements injecting and dowel adjust. I've let it dry a day though nothing has moved for approximately 3 hours. Then the 80cm satellite mirror mounted, sealed and until today despite major storms yet everything drann :-)