1:48 aircraft photo-etch forms the backbone of the etch range. It covers hundreds of types, from the MiG-15 through the Lockheed Hudson to the Macchi MC.202: flaps, gear bays, exterior sets and steel seatbelts, each cut around a specific kit. 1:48 gives the best balance between the size of the parts and the effect they produce.
Always match the set against your actual kit, because the same aircraft is tooled by several firms. The starting model is in 1:48 aircraft model kits, every etch size in aircraft photo-etch sets, and the armament is finished with 1:48 turned metal barrels. Plan ahead: gear bays and flaps affect how the wings go together, so buy the set before you start building.