Is this the version that is a straight shaft or the newer version with the interchangeable tip?

The 671-6 model has a fixed "cabinet" (flat slot) tip. It looks like model 67100 has the interchangeable tip. http://www.kleintools.com/catalog/interchangeable-rapi-driv/2-1-rapi-driv-screwdriver

The rubber handle cover has the words "Made in U.S.A." molded in. I would assume that this relates to the entire tool, but who knows? I will say that Klein Tools are fantastic, and I often select this brand over others when I have the choice for a particular style of tool.

Is the shaft suppose to free spin from the handle?

The shaft spins freely. In my experience, it's a two-handed tool. Hold the shaft in the screw head with one hand and spin / crank it with the handle. I find it very useful for seating small screws quickly.

Is this a plain "regular" or "flat head" tip? That's what I am looking for. I don't know what a "cabinet tip" is...

"Cabinet Tip" means that the shaft of the flat/slot driver is parallel all the way down the full length of the shaft. This is in contrast to "Keystone" flat/slot tips that flare out (like it's been hammered flat), so that the tip has sort of an angle both on the flats and the sides too; Keystone tips won't fit into narrow holes like Cabinet tips will. The shafts on Keystone tip drivers are usually a bit thicker, too, so more power can be applied (though that's not always good). Phillips/Torx/Robertson (square) tips do not have Keystone tips, I can't come up with any type of tip other than Flat that has a Cabinet or Keystone choice involved.

Manufacturer	Klein Tools
Part Number	670-6
Product Dimensions	30.48 x 12.7 x 5.08 cm; 13.61 g
Item model number	670-6
Size	3/16-Inch Cabinet Tip
Colour	Black
Style	3/16-Inch Cabinet Tip
Finish	Brushed
Material	Alloy Steel Rubber
Pattern	Screwdriver
Shape	Rectangular
Power Source	hand_powered
Item Package Quantity	1
Head Style	Flat
Measurement System	Metric
Special Features	Insulated
Included Components	3/16'' Cabinet Rapi-Driv Screwdriver 6"
Batteries included?	No
Batteries Required?	No
Item Weight	13.6 g

670-6 Screwdriver, 3/16-Inch Cabinet Tip, Rapi-Driv with 6-Inch Shank, Made in USA

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