Donut Magnet with Protective Chrome Plated Metal HousingDescription:They’re fairly strong, but unfortunately we’re unable to quantify their strength. Great for school projects.Powerful ring magnet encased in a durable metal cup, with a mounting hole in the center.Attach a hook, eyebolt, knob, etc. to the magnet to provide a great solution for hanging objects from various surfaces.Overall Dimensions: 1.4″ Diameter x 0.281″ Height.Dimension of Magnet Hole: 0.375″ Diameter x 0.23″ Depth to HousingCenter Hole Size on the Metal Housing: #8Sold Individually