Slide the mag-A-bit magnetizer onto a driver bit or screwdriver of your choice, firmly holding the screw in place and making it easier to drive screws in places where it can otherwise be difficult to reach. The unique design of the precision-machined stainless steel ring allows the mag-A-bit to be used on 1/4 hex shanks as well as on much smaller driver bits and screwdrivers because the three powerful neodymium magnets housed inside the ring have freedom to move as much as needed while not falling out.