A drift is used to make a std type B manipulative joint ie drift the end of the pipe out.
A swager (pronounced swadger) is used for kingley type B's and is used to form a ring on the pipe.
Lots of houses up here still have securex and PDM drifted fittings and many houses built in the 50's have kingleys.
You can come off an imperial drifted fitting if you hammer the nut on the pipe then drift it
You can still use a swager if you are short of an olive for a type A (compression)
Here are a couple of instruction sheets i dug out if anyone is interested how they work.