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. Set includes a handle and two reversible shafts. Remove and replace the shafts to use a different size or drive style. Ceramic is nonmarring and won't scratch components, but it's also brittle so these tools are not recommended for final tightening of screws.