Suitable for use with Phillips Head Micro-Trains coupler screws and other very small size screws used in locomotives etc.
Best paired with a 4mm hex shank screwdriver handle that you may already own. Bit is held in place with magnets inside screwdriver handle.
- Bit size: 4mm hex shank (3/25″)
- Length: 28mm
- Material: S2 Alloy Steel