Ok. Good to know. I definitely have a drill.
I am still not sure these are GTS headers.
The collector looks different from the GTS headers - at least the ones sold here (I don't have any other frame of reference, so you guys that have been doing this longer than me may know better).
Also at Hall:
The ones in the attached photo are like mine (from an eBay ad).
Here is an old post where the 3rd message shows a ceramic coated set like these that the owner thought were Hall Big Bores...