Single hex screwdriver 405 4.0 Wiha 03850.

Material:
Ductile-hard chrome-vanadium-molybdenum steel, fully hardened and chemically blackened.

Application:
For protecting thread while removing damaged or broken screws with left- or right-handed thread, especially hexagonal socket screws that have been twisted. Simply insert the screwdriver, firmly attach the socket wrench, and unscrew without locking.