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Amazon.com: Ferrite Ring Magnets with Holes - 1.2 Inch (31mm) Round Disc Donut Magnets - Circle Hole Magnets - Perfect Ceramic Circular Magnets for Crafts and DIY : Industrial & Scientific
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Ceramic Ring Magnets (2pk) - 1.75'' O.D. x 0.225'' I.D. x 0.225'' Thk.¸ 2.17 lbs. pull 07288 - First Industrial Supplies
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