## Common ground
All are knot holders—tools used to temporarily secure or hold knots in place during tying, sewing, or rigging.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from plastic, offering lightweight and often disposable use.
- **Typical examples:** Plastic cable ties, temporary knot clips for fishing lines, plastic sewing aids.
- **Best fit when:** Lightweight, low-cost, or single-use applications are needed; resistance to moisture or corrosion is important.
**8302.49 – Made of base metal**
- **Defining trait:** Constructed from metals like steel, brass, or iron, providing durability and strength.
- **Typical examples:** Metal clamps for rope splicing, industrial knot holders, marine rigging tools.
- **Best fit when:** High-stress environments, repeated use, or long-term holding is required.
## Key differences
| Feature | 3926.90 (Plastic) | 8302.49 (Base Metal) |
|------------------|--------------------------|----------------------------|
| Material | Plastic | Steel, brass, iron |
| Durability | Low to moderate | High |
| Use case | Temporary, light-duty | Permanent, heavy-duty |
| Corrosion resistance | Good (if non-porous) | Varies (may rust) |
## How to choose
- Is the knot holder meant for one-time or short-term use? → 3926.90
- Does it need to withstand high tension, repeated use, or harsh environments? → 8302.49
## Overlaps & pitfalls
A product could be made of metal but coated with plastic (e.g., a steel clamp with a plastic grip), which might blur the line. In such cases, prioritize the **primary structural material**—if metal forms the core load-bearing part, use 8302.49. If the plastic is dominant in function and form, use 3926.90. No option is inherently more accurate without context