This package contains Four PC4-M10 Bowden Fittings. These are the not-straight-thru kind.

These fittings do not allow the tube to pass all the way through. They can be used, for example, in a CR-10 hotend, if you want to sandwich a second piece of tubing inside the hotend while terminating the Bowden at the fitting.

Note that they may be brass instead of stainless like the picture.

0.9mm pitch.

For 1.75mm filaments.