## Common ground
Both options refer to hardware used to attach or support doors or windows.
## Options at a glance
**3925.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from plastic (e.g., PVC, polypropylene), not metal.
- **Typical examples:** Plastic door hinges, window brackets, plastic screw caps for fittings.
- **Best fit when:** The mounting is lightweight, corrosion-resistant, and made entirely or mostly of non-metal materials.
**8302.41 – Made of base metal**
- **Defining trait:** Constructed from iron, steel, or other base metals (not precious or rare metals).
- **Typical examples:** Steel door hinges, brass window catches, iron mounting brackets.
- **Best fit when:** The fitting is strong, durable, and made from ferrous or non-precious metal.
## Key differences
| Feature | 3925.90 (Plastic) | 8302.41 (Base Metal) |
|---------------------|--------------------------|----------------------------|
| Material | Plastic (non-metal) | Iron, steel, or base metal |
| Durability | Lower, more prone to wear| High, long-lasting |
| Corrosion resistance| High | Low (unless coated) |
| Weight | Light | Heavy |
## How to choose
- Is the fitting made of plastic? → 3925.90
- Is it made of iron, steel, or another base metal? → 8302.41
## Overlaps & pitfalls
A fitting may contain both plastic and metal parts (e.g., a metal hinge with plastic bushings). In such cases, the **main structural material** determines the classification. If unclear, prioritize based on the product’s primary function or dominant material. No option is inherently more correct—choose based on the defining component