12.5 mm (1/2") square drive · with trigger (safety lock)· for hand-operated socket wrench inserts and ball lock · chrome-vanadium steel · chrome-plated · ground · Special product advantages: Convenient access to screws that are deep in the object, locking ring to prevent the socket wrench insert from accidentally coming loose from the extension
A ratchet with push-button release, such as item no. 40 00 821 574, 40 00 821 581, 40 00 821 578 or 40 00 821 575 recommended · Other technical properties Surface: chrome-plated • Material: vanadium steel