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DIYMAG Strong Neodymium Fishing Magnets, 700 lbs(318 KG) Pulling Force Rare Earth Magnet with Countersunk Hole Eyebolt Diameter 2.95 inch(75 mm) for Retrieving in River and Magnetic Fishing: Amazon.com: Industrial & Scientific
Tiny Magnets 4x0.5 mm Neodymium Disc small thin neo craft magnet 4mm dia x 0.5mm | eBay