If you are a looking for a flat head screwdriver, or flat head screwdriver bit, Wiha has a complete list of every slotted screwdriver, insulated slotted screwdriver, and slotted bit size that we have available. The list converts the metric mm size to the inch equivalent, since Wiha screwdrivers are designed in Germany they are made to international standards and may not be an exact match to common North American sizes.
The most common flat head screwdriver sizes we sell are 3.5mm slotted screwdriver for precision and controls work, 5.5mm slotted screwdriver for general purpose, and the largest size 6.5mm slotted screwdriver is used for larger screws.