The most varied part of the etched range for rotorcraft belongs to quarter scale: photo-etched parts for 1:48 helicopter models run from standalone steel harnesses through interior sets to complete frets that include armament, covering the small AH-6, the Black Hawk family, the Mi-24 and naval Sea Kings. Every fret is designed for a particular kit, which is named in the title of the set.
Quarter scale is a reasonable compromise for brass: parts are large enough to handle comfortably and fine enough to look in scale on 1:48 helicopter kits. For etch and masks in one box, look at 1:48 helicopter upgrade sets; the complete fret listing is in helicopter photo-etched parts.