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SuperMagnetMan - Neodymium Magnets, Many Shapes & Sizes!
DIYMAG Super Strong Neodymium Fishing Magnets, 1200 lbs(544 KG) Pulling Force Rare Earth Magnet with Countersunk Hole Eyebolt Diameter 3.94 inch(100mm) for Retrieving in River and Magnetic Fishing: Amazon.com: Industrial & Scientific