Schley (SCH63800) Cam Seal Installer with 10 and 12mm X 12.5 Threaded Cam Bolts
Holy crap this things works awesome.  It comes with the two different bolts for different cam shaft sizes.  I have used this for two engines now, a 2000 Camry 2.2L, and 2004 Sienna with the 3.3L.  I could have never done the Sienna without this tool.  On top of that it is nearly half the price of the Snap-On version.  I fear no cam shaft seals anymore with this tool.