What is the Park Tool SD-3 Flat-Head Screwdriver 3mm for?

The Park Tool SD-3 Flat-Head Screwdriver is a 3mm precision flat-blade tool sized for the smallest slotted fasteners found on bicycle components: cable pinch bolts, brake pad adjustment screws, and other fine-thread hardware where a standard screwdriver is simply too wide to seat properly. The chrome vanadium steel tip is ground to a precise 3mm width to prevent cam-out and protect the soft alloy fasteners common to high-end components.

The ergonomic handle allows controlled, tactile torque application, which is critical when working with tiny fasteners that strip at surprisingly low force. Keep the SD-3 alongside your Phillips screwdrivers as a complete set. Having the right blade width for each job is one of the simplest ways to avoid unnecessary fastener damage during service work.