JUNAN Neodymium Cylinder Magnet 20mm Dia x 3mm Thick Super Strong10 Pack Powerful Permanent Rare Earth Disc Magnets with 10Pcs Double-sided Adhesive, Round Magnets for DIY Crafts, Refrigerator : Amazon.co.uk: Business, Industry
20mm x 3mm x (5mm Hole) Countersunk Neodymium Magnet N38 (Pull 3.81KG) - Magnet Store
100PCS Neodymium Magnets - 20mm 15mm 10mm 8mm 6mm Diameter Round Strong Magnets,Small Round Magnet for Whiteboards, Fridge or Picture Magnet : Amazon.co.uk: Business, Industry & Science
Bi-Office Round Magnets 20mm Blue (Pack 10) - HuntOffice.co.uk
Q-Connect Round Magnet 20mm Assorted (Pack of 60) KF02040Q