Replacement pull tab (finger grip) for fly screen / insect screen kits, the type with four extendable metal bars where you cut mesh to size. 

These plastic rings are screwed onto the frame; you hook a finger through them to pull the frame tight against the window while fixing the metal grip brackets. 

Original parts snap easily, so this is a sturdier remake.

Before mounting to frame the printed part should be bent outwards at least 30 degrees to actually get a finger through (like the original part)

PETG recommended

Distance between holes: 24mm

Hole diameter: 2mm (fits original screws with 3mm diameter)