Hank:
My understanding, was it is the same as those used on other Remington style actions. The adapter was to mate the Jewell to the Sako action. Mine measures .300"
If you're talking about just the blade of the trigger, the Jewel triggers on both my Sako and my 40X measure .165. Jewel no longer makes a trigger for the Sako but I believe the blade width on all Jewel triggers is the same.