## Common ground
All options are metal chains used for sink stoppers, lavatory cisterns, and similar plumbing fixtures.
## Options at a glance
**7315.89 – Iron or steel**
- **Defining trait:** Made from iron or steel, typically more durable and heavier than other metals.
- **Typical examples:** Bathroom sink drain chains, toilet flush chain with metal weight.
- **Best fit when:** High durability and resistance to wear are needed, especially in heavy-use environments.
**7419 – Copper**
- **Defining trait:** Made from copper, known for corrosion resistance and aesthetic appeal.
- **Typical examples:** Decorative bathroom fixtures, vintage-style sink chains.
- **Best fit when:** Long-term corrosion resistance or visual elegance is prioritized over cost.
**7616.9X – Aluminium**
- **Defining trait:** Made from lightweight aluminium, resistant to rust but less strong than steel or copper.
- **Typical examples:** Lightweight drain chains in residential kitchens or low-use bathrooms.
- **Best fit when:** Weight reduction and resistance to rust are key, especially in moisture-prone areas.
## Key differences
| Feature | Iron/Steel (7315.89) | Copper (7419) | Aluminium (7616.9X) |
|------------------|------------------------|--------------------|------------------------|
| Weight | Heavy | Medium | Light |
| Corrosion resistance | Low (rusts if untreated) | High | High |
| Durability | Very high | High | Moderate |
| Common use | Industrial/residential | Decorative | Residential, light use |
## How to choose
- Is the chain for heavy-duty or frequent use? → 7315.89
- Does appearance or rust resistance matter most? → 7419
- Is lightweight and low maintenance important? → 7616.9X
## Overlaps & pitfalls
A chain may combine materials (e.g., copper-coated steel), but the primary material determines classification. If unsure, prioritize the dominant metal. No option is clearly superior—choice depends on use case