Super Strong Neodymium Disc Magnets, Powerful N52 Rare Earth Magnets for Fridge, DIY, Building, Scientific, Craft, and Office Magnets- 1.26 inch x 1/8 inch (20)

Erase 5kg from your search and just search N52 magneta. Click links and convert kg -> lb. one of these holds 18lb, or 8.165kg

Yeah because you googled and didn't actually read anything or try. Here's an Amazon link, these hold 18 lbs each. https://a.co/d/04dsEJvD