20mm dia x 10mm thick N52 Neodymium "Strongest Grade" Magnet
CMS Magnetics® Grade N52 Super Strong Neodymium Magnet Ring OD1.26" x ID 1/2" x 3/8" - Rare Earth Magnet Ring for Classroom, Science Project and DIY Applications - One Pack: Amazon.com: Industrial
40 x 20 x 5mm thick Ultra High Performance N52 Grade Neodymium Magnet - 15.1kg Pull
1 x 3/16 Inch Neodymium Rare Earth Disc Magnets N52 (5 Pack) for Sale | totalElement