If you are going to use the flag for your car

recessed screw head aligns with the surface of the magnet

This model is particularly strong and can be used on magnetic glass

10-pak farverige ludo-magneter

Ferrit magnet, Skive 40x10 mm. julepynt If you are going toFerrite magnets Raw magnets Diameter: 40 mm Height: 10 mm Strength: approx. 2,400 gr. Large ferrite disc magnet. Ferrite magnets withstand temperatures of up to 250C and down to 40C and are therefore for both indoor and outdoor use. Magnets should always be kept away from small children due to the risk of suffocation. Ferrite magnets are a bit fragile as they don't have a protective coating. Avoid bumps and knocks. Only work with magnets using tools