CNC cutting files for fabricators
https://www.theboilershop.com.au/
Curvomark: https://www.weldclass.com.au/tag/1br...
Flange wizard: http://flangewizard.com/
All pipe fab needs: https://pipefitter.com/
In this short video lecturer Glen Jones explains techniques used by fabricators to align pipes, flanges and elbows.