This magnetizer/demagnetizer is made of shatter-proof, high-quality plastic and uses two C8 permanent industrial magnets. Works with items over 1.3" in length and 1/8" in diameter. Instantly magnetizes or demagnetizes steel screwdriver blades, tweezers and other small tools; no batteries or electrical power required. Dimensions: 2" x 2" x 1". Made in Germany by Wiha Quality Tools, which offers a lifetime guarantee on most of their tools.