Cylindrical key lock for anti-theft device for vehicle steering wheel immobilisation

Cylindrical key lock (24) for an anti-theft device for preventing the rotation of the steering wheel of a vehicle, comprising an internally hollow body (3) housing a fixed part (9) having an external profile identical to the internal profile of a first lower part (31) of the key (5), a rotating part (11), arranged under said fixed part (9) and having the same profile, integral with a lower cylindrical element (13) having the base surface (15) inclined, and a pawl (17), axially pushed by a spring (19) against the inclined lower surface (15) of the lower cylindrical element (13), the key (5) being moreover provided with a cylindrical internal part (33), on the top of the lower part (31), able to rotate around the fixed part (9) of the lock.