Magnetizer/Demagnetizer, Magnetizes & Demagnetizes Screwdriver Tips & Bits Using Powerful Rare Earth Magnets, Single Swipe Operation, Fits Most Screwdrivers Including Precision Screwdrivers, 1/4 Slotted, #2 Phillips & #3 Phillips, Attaches To Tool Bags Or Backpacks With The Included Stainless Steel Key Ring, No Batteries Required, To Magnetize: Insert Screwdriver Fully Into Magnetizing Slot, Avoid Rotating The Shaft While Drawing Out Slowly, To Demagnetize: Insert Screwdriver Fully Into Demagnetizing Slot, Avoid Rotating The Shaft While Drawing Out Slowly.