We report on BeppoSAX broad band (0.1-100 keV) observations of bright Seyfert 2 galaxies and discuss the results in the framework of the unified theory of AGNs. The data are used to probe Nh distribution in type 2 objects and to identify heavily absorbed (10^24 <= Nh <= 10^25 cm^-2) sources, which are particularly bright in hard X-rays. They also provide, for the first time, high energy spectral data on Seyfert 2s and tight constraints on the shape of their intrinsic power law continuum. These results confirm the basic expectations of the unified theory and indicate where the INTEGRAL mission can give a substantial contribution.
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