A compilation of the multipole mixing of 2′ + → 2 + transitions in 186 Os, 188 Os, 190 Os and 192 Os is given. In view of recent results obtained at our laboratory, indicating large anomalies in the conversion process of inhibited M1 transitions, the study has been extended for even-even Osmium nuclei. A series of experiments has been performed in which the conversion coefficients and transition probabilities were measured. The data of 2′ + → 2 + transitions were analysed by taking into account nuclear structure effects on the Ml internal conversion process. The M1 admixtures obtained are compared with Greiner′s calculations. Values of reduced transition probabilities B (E2, 0 → 2 +) , B (E2, 2′+ → 2+) , the mixing ratio δ = 〈2 || E2 || 2′〉 / 〈2 || M1 || 2′〉 and the transition branching ratio T (2′ → 2)/T(2′ → 0) are reported for second and higher 2+ states. The results are compared to the pairing-plus-quadrupole model calculations of Kumar and Baranger.