Place the shaft of the screwdriver (near the handle) onto a strong magnet, such as one from a stereo speaker. Hold the screwdriver to the magnet away from you.
Pull the screwdriver along the magnet toward you until it slides completely off the magnet. Be sure to rub the tip of the screwdriver across the magnet as you pull.
Repeat Steps 1 and 2 several times to ensure the screwdriver has a strong magnetic charge.
Demagnetize the screwdriver, if necessary, by doing the reverse of Steps 1 and 2: Starting with the tip, place the screwdriver on the magnet and push it away from you.