A various of steering wheel locks are seen in the market for protection of automobiles, one of which is a lock utilizing two bars 4 and 6, as shown in FIG. 4, to extend beyond the steering wheel so as to prevent steering the wheel illegally. This lock utilizes grooves 41 on one bar for locking purpose. Whereas when the grooves 41 are inserted into a lock mechanism 5 on one end of the other bar 6, the grooves 41 will mesh with the lock thus confining contraction of the lock bar. This improves the autotheft, however, it can not protect an air bag stored in the steering wheel from being stolen.
Another lock, as shown in FIG. 5, was therefore invented which includes a semi-circular cover 7 having a pair of holes 71 for a pair of hooks extending from a solid bar 91 and a telescope bar 92 to extend therefrom, however, the conventional art still possesses shortcomings, first of all, the edge of the cover 7 did not cover any portion of the steering wheel 8, since different vehicle model has different size of steering wheel, a gap exists between the cover 7 and the steering wheel 8, the conventional art is more complicated and requires more parts to assemble.