These are vacuum nozzles for the CAMLOCK system. A few select sizes.
The nozzle name format is (end-depth by end-width by end-angle)
so the 20x80x60 named nozzle is 20 mm deep, 80 mm wide, with a 60 degree end.
Made to fit the CAMLOCK by PeterH
https://www.printables.com/model/513981-camlock-adaptors-in-05-mm-increments
https://www.printables.com/model/531466-camlock-suction-end-nozzles-in-all-sizes-and-shape
https://www.printables.com/model/528075-camlock-adapter-for-ridgid-hose-od-4350-mm
The author remixed this model.
Used design of the camlock.