The round notch will assist you in removing smaller disc magnets and bar magnets

To address this concern

stainless steel is not magnetic

but if it's a bigger thing where we have to make calculations and help with testing

MIAV kattemagneter, 5-pak - køleskabsmagneter Auto-translated (NO) The round notch will assistBlack cat magnets for the fridge. The perfect gift for cat lovers. We deliver all Trendform magnets in beautiful transparent gift boxes. Made with strong neodymium magnets on the back. Can easily hold 3 4 pcs. of paper on the fridge. Strength: approx. 0. 5 kg. Size: approx. 31 x 29 mm. Producer: Trendform. Art. no.: FA4583 Trendform MEOW. NB! Not for small children it is dangerous to swallow magnets.