The proposed invention relates to the field of drilling oil and gas wells, namely to devices for increasing the inner diameter of the drill holes for all applications. The device is intended for fixing the equipment is tested at the inertia and other types of loads, which could lead to his lapel. protivootvorota apparatus comprises a housing pin and a plug in the housing formed with apertures, mounted retainer, the bottom of which is filled with an oval shape, and the upper part - cylindrical shape with recesses with curved and straight surfaces and the abutment end face, through housing openings to the bore retainer mounted fingers, with their continuous preload to the spring retainer is provided fastened in a housing with plugs, and the retainer is formed with the flush port. The oval shape of the bottom of the retainer provides a secure fastening it with lockable part because prevents rotationally lockable lock part and between themselves, and also capable of accepting high loads. Tightening the threaded joint is carried out without the resistance due to urging the finger and the special shape of the bore retainer, and as a consequence, the possibilities of movement on it while driving in the clockwise direction without resistance. N.p.f. 1, 2 of FIG.
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