They range from approx 30 pounds to 80 pounds, depending on the thickness of the drywall and upon the thickness of the screw/bolt that comes with the anchor. There is a chart on the packaging. I used the thicker screw version to install two floating shelves (ten inch deep shelves, rated for 20 pounds load) using 2 anchors per shelf in a location where there were no studs (newer house with studs 24 inches on centre) and the shelves feel feel strong once installed due to the toggle bar part of the anchor that remains behind the wall.This anchor is basically a combination of a metal toggle bolt plus a plastic socket that fills the hole plus a plastic strap to pull the toggle bar tight. The advantages of these anchors compared to old style metal toggle bolts are: Smaller hole (1/2 inch) since the toggle bar is solid metal and it folds in one piece to get it through the hole, stronger since the toggle bar is one solid piece, the plastic socket completely fills the hole. You install the toggle and socket first, by pushing then through/into the hole, then pull the toggle bar tight behind the wall using the strap, then cut the excess strap length with a utility knife, and then you attach what you want using the included anchor bolt. The u-shaped strap is grooved to guide the anchor bolt into the metal receiving socket in the toggle bar while you screw in the bolt.. TIPS: Install the anchor in the correct orientation so that the u-shaped trough in the strap points upward. Using a large drill bit such as half an inch (as per directions) makes the job go faster.