Pacific Dualies 18090 90 Degree Valve Stem Extension - Set of 2

May sound silly, but, am I correct you thread the small end onto the valve stem and the chuck connection is under the metal cap on the long end.

What is the length from the bend to the part that screws onto the tire valve stem?

Will this work for rubber stems on my aftermarket rims?

Does the female end swivel, or do you have to turn the whole unit to install