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3" x 1/2" x 1/4" Ring - Neodymium Rare Earth Magnet, Grade N48: Amazon.com: Industrial & Scientific
CMS Magnetics Super Powerful N52 Neodymium Ring Magnet OD 2 x ID 1 x 1/4" w/ 46 LB Holding Power - Rare Earth Ring Magnet 1 Piece: Amazon.com: Industrial & Scientific
