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### Product Description
These are components for 1:64 scale car model modification, including wheels, axles, hollow tubes, and nails.  

#### Key Dimensions:  
- **Wheels**: Single - wheel diameter is approx 10.5mm. Axle lengths (distance between two wheels) have variations, like ~18.6mm and ~31.1mm (as measured).  
- **Hollow Tubes**: Diameter 0.8mm, length 25mm.  
- **Nails**: Length 12mm.  

#### Package Options (examples):  
- “Five - set”：20 wheels + 10 axles.  
- “Nine - set”：36 wheels + 18 axles.  
- “Hollow axle set”：Combinations of hollow tubes, nails, and wheels (e.g., 20 hollow tubes + 40 nails; 4 wheels + 2 axles in some single - style packs).  

Suitable for customizing 1:64 scale miniature cars, providing parts for wheel - related modification needs.