DIYMAG Powerful Neodymium Disc Magnets, Strong, Permanent, Rare Earth Magnets. Fridge, DIY, Building, Scientific, Craft, and Office Magnets, 1.26”D x 1/8”H, Pack of 6 by DIYMAG
Possible homebrew-related uses: Organize and hang compatible metallic tools. Use to pin up instructions or decorations. Build a stir plate or use as part of a magnetic drip tray build. See: How To: Step by Step Making a Magnetic Drip Tray – note that this uses different magnets
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Make sure the components you use are compatible and rated for your intended application. Contact manufacturer with questions about suitability or a specific application. Always read and follow manufacturer directions.