Version:
Hardened and nickel-plated. Square drive and square socket the same size.
Application:
For extending short taps (e.g. DIN 351 / 352 / 2181 / 5157), hand reamers and other tools with square shanks.
Note:
Extensions for machine taps with shank, e.g. to DIN 371 / 374 / 376, can be found under
No. 338400.