## Common ground
All options are wall-mounted racks, designed to hold items on a wall using fixed supports.
## Options at a glance
**3924.90 – Plastic material**
- **Defining trait:** Constructed primarily from plastic, often lightweight and resistant to moisture.
- **Typical examples:** Plastic shelf brackets, shower caddies, kitchen spice racks.
- **Best fit when:** The rack is made of molded or extruded plastic, not wood or metal.
**4420.90 – Wood, marquetry or inlaid wood**
- **Defining trait:** Made from solid wood with decorative inlays or intricate surface work (marquetry).
- **Typical examples:** Decorative wall shelves with carved details, inlaid picture frames, luxury storage units.
- **Best fit when:** The rack features visible wood grain, inlays, or artistic woodwork beyond basic construction.
**4421.9X – Wood (general)**
- **Defining trait:** Made of wood but without marquetry or inlay; plain or minimally finished.
- **Typical examples:** Simple wooden shelf brackets, basic wall-mounted book racks, rustic storage.
- **Best fit when:** The rack is made of wood but lacks decorative elements like inlays or carvings.
**8302.50 – Base metal**
- **Defining trait:** Constructed from non-precious metals like steel, iron, or aluminum; often durable and load-bearing.
- **Typical examples:** Metal wall brackets for tools, industrial storage racks, steel shelf supports.
- **Best fit when:** The rack is made of metal with no plastic or wood components visible in structure.
## Key differences
| Option | Material Type | Surface Detail | Durability | Typical Use Case |
|-------|----------------|----------------|------------|------------------|
| 3924.90 | Plastic | None | Low to medium | Light-duty, indoor use |
| 4420.90 | Wood (decorative) | High (inlays/marquetry) | Medium | Aesthetic, premium interiors |
| 4421.9X | Wood (plain) | None | Medium | Basic storage, rustic style |
| 8302.50 | Base metal | Minimal | High | Heavy-duty, industrial or tool storage |
## How to choose
- Is the rack made of plastic? → 3924.90
- Does it have visible inlays or decorative woodwork? → 4420.90
- Is it plain wood with no decoration? → 4421.9X
- Is it made of steel, iron, or aluminum? → 8302.50
## Overlaps & pitfalls
- A wooden rack with inlays could fit both 4420.90 and 4421.9X; use **4420.90** if decorative elements are present.
- A metal rack with plastic parts may still be classified as 8302.50 if metal is the primary structural material.
- If unsure, prioritize the **main structural material** and **presence of decoration**