I used these 1-1/4 anchors with #10 sheet metal screws on 1/2" pipe hangers on a plaster wall. The anchors worked fine and fitted the screws snugly. I pre-drilled quarter-inch holes. To test, I drilled a hole in a piece of wood and checked the dowel so I didn't have to fiddle with plaster in case the hole was the wrong size. fifteen anchors for this mini-project, and all went in with a few hammer blows, no plaster was damaged.
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