## Common ground
All options are overhead storage racks made from different materials.
## Options at a glance
**3924.90 – Plastic material**
- **Defining trait:** Constructed primarily from plastic, often lightweight and resistant to moisture.
- **Typical examples:** Plastic shelf units for kitchens or garages, modular storage bins.
- **Best fit when:** The rack is lightweight, molded, or used in damp environments like bathrooms or outdoor spaces.
**4420.90 – Wood, marquetry or inlaid wood**
- **Defining trait:** Made from solid wood with decorative inlays or veneers; typically higher-end finishes.
- **Typical examples:** Decorative wooden shelves with carved details, inlaid wall-mounted racks.
- **Best fit when:** The rack has visible wood grain, intricate design, or is used in formal interiors.
**4421.9X – Made of wood**
- **Defining trait:** Constructed from solid wood without decorative inlays; simpler construction.
- **Typical examples:** Basic wooden shelves for garages, utility rooms, or workshops.
- **Best fit when:** The rack is plain, functional, and made entirely from wood without added decoration.
**8302.50 – Base metal**
- **Defining trait:** Made from iron, steel, or other base metals; typically durable and load-bearing.
- **Typical examples:** Steel overhead racks in industrial settings, metal shelf frames with brackets.
- **Best fit when:** The rack is heavy-duty, used for storing tools or equipment, and has a metallic frame.
## Key differences
| Feature | 3924.90 (Plastic) | 4420.90 (Inlaid Wood) | 4421.9X (Wood) | 8302.50 (Base Metal) |
|------------------|-------------------|------------------------|----------------|------------------------|
| Material | Plastic | Decorative wood | Solid wood | Iron/steel |
| Durability | Low to medium | Medium | Medium | High |
| Use case | Light storage | Aesthetic focus | Functional | Heavy-duty |
## How to choose
- Is the rack made of plastic? → 3924.90
- Does it have inlaid or decorative wood? → 4420.90
- Is it plain wood without decoration? → 4421.9X
- Is it made of steel, iron, or other metal? → 8302.50
## Overlaps & pitfalls
A wooden rack with inlays could fit both 4420.90 and 4421.9X. Choose **4420.90** if decoration is prominent; otherwise, use **4421.9X**. No option is vague—each clearly defines material type. If unsure, prioritize the **most defining feature**: decoration for inlaid wood, plainness for standard wood