The apparatus, which the blocking in rotation of a part in the course of its screwing, characterized in that it has, on the one hand, a structure, the two parallel vanes (11, 12) with different length, which are interconnected by means of a lateral core (13) are connected, extending perpendicularly to the wings (11, 12) extends, wherein the wing with a greater length of the core opposite a continuous hollow chamber (16), in which the nose (2) of a screwdriver / machines is altered achieved by edged rains consisting of machines with a threaded extension (4) is provided, the insertion and can be fixed, and between the hollow space (16) and the core (13) a first continuous bore hole (19), where the wing with a smaller length a continuous bore (20) is arranged coaxially to the first, and, on the other hand, a spindle (21), the sliding manner in the two bores (19, 20) parallel to the axis of the threaded portion (21) is installed, and elastic means (26), which are so arranged that they burden on the spindle (21) and ensure,..
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