Magnetic strength can be multiplied by up to 32 times by using steel armatures to concentrate magnetic flux. Such armatures may take the form of backing plates, channels or cups. The maximum increase in power is obtained when magnets are sandwiched between two plates. Add a hook or knob, and these magnets are perfect for holding and positioning shop lights, tools, plants and more to steel surfaces such as refrigerators, filing cabinets, metal beams, walls and doors.

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