## Common ground
Both options describe tools used to operate valves, specifically valve keys or wrenches.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from plastic, typically for lighter-duty or non-corrosive applications.
- **Typical examples:** Plastic handwheel wrenches for garden hoses, low-pressure valve tools in household fixtures.
- **Best fit when:** The tool is lightweight, used in non-industrial settings, or needs corrosion resistance and insulation.
**8204.11 – Made of base metal**
- **Defining trait:** Constructed from ferrous or non-ferrous metals (e.g., steel, brass), suitable for heavy-duty or high-pressure environments.
- **Typical examples:** Steel valve wrenches for industrial pipelines, brass handwheels in chemical plants.
- **Best fit when:** The tool must withstand high torque, extreme pressure, or harsh conditions.
## Key differences
| Feature | 3926.90 (Plastic) | 8204.11 (Base Metal) |
|---------------------|--------------------------|----------------------------|
| Material | Plastic | Steel, brass, etc. |
| Durability | Low to moderate | High |
| Use case | Light-duty, household | Industrial, high-pressure |
| Corrosion resistance| Often good | Varies (e.g., brass resists) |
## How to choose
- Is the tool made of plastic? → 3926.90
- Is it made of steel, iron, or brass? → 8204.11
## Overlaps & pitfalls
A valve key could be partially metal with a plastic handle (e.g., metal jaws, plastic grip), which may create ambiguity. In such cases, the **primary material** determines classification: if the main body is plastic, use 3926.90; if metal components dominate, use 8204.11. The defining feature should be based on structural material, not just a handle or accessory