You shouldn't have to Gap Bosh Iridium Spark Plugs or any other brand spark plugs since the spark plugs today most always come with the gap already set from the factory.
However I have found that a few were not completely set correctly so it's a good idea to at least check the spark plug gap of the spark plugs you install in your vehicle since proper gap is essential to your engine burning the fuel properly and running correctly.
You can easily test the gap and set the gap with a cheap spark plug gap tester from Autozone or other auto parts stores.
Just gently bend up or down the piece of metal above the tip of the spark plug to set the gap.
Your vehicle should have the gap specs located under the hood of the vehicle near the hood latch or you can look online or ask on here what gap specs your vehicle requires but just be sure to give us the make and model of your vehicle as well as the engine size as well as the year of the vehicle so we can give you proper instructions on the gap settings.