I ordered these for a magnetic phone stand I was designing to 3D print. They work and hold the phone, but 15 of them are needed. I know the sizes but for some reason I was thinking of going up a size. However, they make good non-standard fridge magnets. I give them a good rating because they are great for what they are and for their size. I had no chips or cracks. The strength is respectable for the size. They are very dimensionally stable and fit into a 5.1mm x 2.1mm 3D printed hole.
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