I use these in several 3D printed designs to adhere parts to metal surfaces. These have functioned perfectly for those purposes. If you want something that has greater 'Adhesion', try the 5mm thick version. I use both the 3mm and the 5mm thick ones in my designs and I have placed multiple orders. All have arrived quickly and worked perfectly. Like all Neodymium magnets, they are a little brittle so don't allow them the snap together as they tend to shatter when that happens.
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