## Common ground
All options refer to window opening mechanisms (e.g., handles, cranks, levers) used to operate windows.
## Options at a glance
**3926.30 – Made of plastic material**
- **Defining trait:** Constructed primarily from plastic or polymer materials.
- **Typical examples:** Plastic window crank handles, injection-molded window levers.
- **Best fit when:** The mechanism is lightweight, low-cost, and used in residential or non-industrial windows where durability is moderate.
**8302.20,8302.30 – Made of base metal**
- **Defining trait:** Constructed from ferrous or non-ferrous metals (e.g., steel, brass, aluminum).
- **Typical examples:** Metal window cranks, brass handles, steel operating levers.
- **Best fit when:** The mechanism requires high strength, durability, or resistance to weather and wear—common in commercial or heavy-duty applications.
## Key differences
| Feature | 3926.30 (Plastic) | 8302.20,8302.30 (Base Metal) |
|---------------------|--------------------------|-------------------------------|
| Material | Plastic/polymer | Ferrous/non-ferrous metal |
| Durability | Moderate | High |
| Weight | Light | Heavier |
| Common Use Case | Residential, low-use | Commercial, high-use |
## How to choose
- Is the mechanism made of plastic? → 3926.30
- Is it made of metal (e.g., steel, brass, aluminum)? → 8302.20,8302.30
## Overlaps & pitfalls
A mechanism may combine plastic and metal parts (e.g., metal screw with plastic handle), but the **primary material** determines classification. If unclear, prioritize the dominant structural material. No option is inherently more correct—choose based on the main material used in construction