This Delcast MBX Magnetizer / Demagnetizer instantly magnetizes and demagnetizes screwdriver tips, tweezers, screwdriver bits and other small ferrous parts. It converts any tool blade into a magnetic retriever for screws, nuts and metallic particles. It can also be used to demagnetize tools which is crucial when working on sensitive electronics such as magnetic hard disk drives. About Delcast: Delcast's mission is to provide a reliable and value-priced helping hand to comp-tech hobbyists, do-it-yourself consumers, and professional technicians alike. Behind every Delcast product is a commitment to strength, durability, and value. Each purchase is backed by a money-back guarantee and lifetime replacement warranty. Your satisfaction is our promise.