18mm x 30mm Cylinder Neodymium Magnet N52 (18.90KG Pull)
Diametrically Magnetised N42 Neodymium Ring Magnet for Arts, Crafts, Model Making, DIY, Hobbies, Office and Home - 30mm O.D. x 10mm I.D. x 10mm thick : Amazon.co.uk: Business, Industry & Science
30mm dia x 10mm thick Ultra High Performance N52 Neodymium Magnet - 24kg Pull
Neodymium Disc Magnet 30mm x 12mm N48| Buy online at AMF Magnets – AMF Magnetics
Diameter 30mm X Hole diameter 10/5.5 X Thickness 5mm Neodymium Magnet (countersink)