2pcs Dia 20/25/30mm Round Neodymium Magnets Thick 3/4/5/10mm With M5 M6 Countersunk Hole Strong Permanent Rare Earth Magnet
https://www.vogueparade.com/shopping/EN/42/1/1005003423842224/2pcs-dia-202530mm-round-neodymium-magnets-thick-34510mm-with-m5-m6-countersunk-hole-strong-permanent-rare-earth-magnet//