Use these ceramic-tipped screwdrivers for adjusting sensitive electronic components such as capacitors and resistors. They're completely nonconductive and nonmagnetic so there's no risk of short-circuiting or creating magnetic interference. Press the rotating end cap on the handle with your palm to apply constant pressure while turning the body of the screwdriver with your fingertips. Ceramic is nonmarring and won’t scratch components, but it's also brittle so these tools are not recommended for final tightening of screws.