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The biggest bomb for the task Israel has is the GBU-28, which can penetrate up to 30m of soil/6m of concrete before detonating. Quite good performance. However, the Natanz enrichment facility is deep underground and better protected than a GBU-28 can penetrate, and the Fordo enrichment plant is built into a mountain (the GBU-28 needs a near vertical drop to work well). Additionally, the only plane the Israelis have that can carry the -28 is the F-15, and only one can be carried per Eagle.

Israel would require larger bunker busters to be assured of reaching the appropriate depth, but they don't own those weapons and they don't have the delivery systems (e.g. a B-2 bomber) to use them.

At most, using current weapons and delivery systems - that are not nuclear - Israel can only damage the Iranian complexes. It is important to note it is just not one target but several - there is Natanz, Fordo, Arak, Parchin, and Isfahan ...and even each of those is not one target.

They key here is that they will need US assistance. Without US assistance then the Israelis will be forced to get VERY creative, and even then it will cost them. The good thing though is that no one does 'creative' quite like the Israelis.