Round Disc Magnet Ø 120 x 50mm Neodymium N45 (NdFeB) Nickel - Force (Strength): 750kg - Super Strong Circle Magnets for Industry and Home : Amazon.co.uk: DIY & Tools
Applied Magnets® 1 Piece 3" OD x 1.25" ID x 1" Grade N45 Neodymium Ring Magnet: Amazon.com: Industrial & Scientific
38mm x 1.5mm 1.5"x1/16" N45 Super Strong Round Disc Rare Earth Neodymium Magnet | eBay
17 mm x 10 mm x 1 mm N45 grade neodymium ring magnets
5 x 4 x 1.5mm thick N45 Neodymium Magnet - 0.5kg Pull