Square Ferrite Permanent Magnet https://www.mlmagnet.com/product/ferrite-square-shape-magnet/square-counterbore-square-ferrite-permanent-magnet.html Square counterbore square ferrite permanent magnet. The material hammer is imported sintered material and its product structure is not the same as magnetic products produced in China. Compared with high-quality copper alloy materials, sintered materials have only a certain resistance to wear, but their strength and toughness are higher than those of copper alloy materials by more than 20%. Email Address [email protected]