Check the listing for details. Milling Grinding Electro Magnetic Chuck Controller 110V 5A LED Display Planer. Condition: New. Listed at 199.49 USD. Three-position switch, the upper left is the magnetic position, the middle is the empty position, and the right side is the demagnetization position. Current capacity: 5 Amp. EASY OPERATION - Small size, easy to use, fast magnetic retraction, clean demagnetization, infinite polarity.