China Nickel Plated Countersunk Pot Magnets are strong, rare-earth (neodymium) magnets encased in a steel cup with a flat-head screw hole, allowing flush mounting; nickel plating (Ni-Cu-Ni) provides corrosion resistance, making them ideal for jigs, fixtures, and holding applications where a secure, non-protruding magnetic attachment is needed, widely available from Chinese manufacturers in various sizes and strengths.