The Connector width is just a tad under 12mm (11.6 from memory) so if it's going through a short solid, like wood or plastic window frame then a 12.5mm Drill Bit should do it, for Brick, Breeze or Concere add a couple of mm as the Drill Bit never drills a perfect hole, 14mm should work, or possibly 16mm if it going to be a fiddly cavity spaced wall.
Tape the plugs Locking Lever down with tape before you start pulling it through in case it gets stuck and you need to pull it back, otherwise your break the Lever and or damaged or stress the connections in the Plug (your see what I mean when you have it in your hands).
The way I normally do stuff like is by using proper Push Rods then a Cord / Wire then the Target Cable all tapped to together, in the absence of Push Rods you could use the long Drill Bit, but don't tape the Target Cable to the Drill Bit, use a Cord or Wire to the Drill Bit then the Cable to the Cord, safest way if it snags and it won't end in tears thar way 😉
