Arduino Mega, Screw (Terminal) it

Folks, I've had several requests for a kit with screw terminals and header pins.
I'm up to at least 16 kits so far.
I don't mind doing a group buy for the connectors, prices drop with quantity.

I've worked up the best combination of Phoenix screw terminals from mouser.
For the life of me I can't figure out what they call stackable headers like these:
http://www.dipmicro.com/store/HDR08X1FL
http://www.dipmicro.com/store/HDR10X1FL

Any ideas?
Thanks
Robert