B-Line Eaton series wiring trough, 4" height, 120" length, 4" width, GRT NK wiring trough, Embossed thru holes, No knockouts, Screw cover, 3R, Steel,

It's built to NEMA 3R, so it's rated for outdoor use against falling rain and sleet. The screw cover seats against a flange and is held by plated screws, which is what keeps water out of the top seam. For washdown or hose-directed environments you'd need a 4 or 4X enclosure instead, not a 3R.

No. The NK in the model designation means no knockouts, so the 4 x 4 x 120 inch body ships solid and you drill or punch your own openings wherever the conduit runs land. That's the point of the NK version, you place holes to suit the job rather than working around factory locations. If you want factory knockouts, order the knockout version of the same GRT series instead.

Yes. The full length of the 44120 has a screw cover, so pulling the plated screws gives you the whole 120 inch run open for pulling, splicing, or adding conductors later. That is a real advantage over conduit when you expect the circuits to change. Leave working clearance in front of the cover so the screws can be reached.

16 gauge steel, finished in ANSI 61 gray, with plated screws for the cover. That is the standard gray you'll see on switchgear and panelboards, so a run of it lines up visually with the rest of an electrical room. The plated screw hardware is what you want if any part of the run sees weather.