Magnetizer Demagnetizer. 2.1" x 2.0" x 1.1". To magnetize and demagnetize steel screwdriver blades, tweezers and similar tools. Box high quality plastic, shock resistant, cadmium free. Uses 2 C8 industrial permanent magnets. To magnetize, lead the tool slowly through the (+) opening, to demagnetize guide tool slowly through the (-) opening. (Parts under 1" length or 1/8" diameter may not demagnetize).