This round base magnet consists of a super strong neodymium magnet, the strongest magnet type available encased in a chrome plated steel cap that magnifies the strength of the magnet by routing the north and south poles of the magnetic fields along the cap resulting in a pull force of 39 lbs. The countersink for a #10 screw also allows for completely flush installation of this cup magnet which further prolongs the life of the magnet by removing any high points of contact.
Please note that the 39 lb pull force of this magnet only applies when used on a flat smooth surface. When used on a painted surface or vertically, the holding power is reduced.
These cup magnets are being sold as liquidation because of of coating defects on the steel cup and the magnet. The epoxy can be easily chipped off of the cup and the coating on the magnet is rusting underneath, causing a bubbled appearance. Their magnetic strength is completely intact and has been unaffected.