Strong Neodymium Magnets, 25 LBS Round Base with Holes, D20mm-8Pack, Metallic

Strong magnets save you more space while giving you quick and easy access to tools. Make it user-friendly. Performance Magnets: Rare earth magnets are made of rare earth materials, The surface of the neodymium magnets is wrapped with a protective steel cup, so the magnet is not easy to break during normal use.

eBay