3 Blades Boat R-Propeller Dia-A=M4, Dia-B=38mm

Dia-A:the hole diameter in propeller    
Dia-B: the diameter of the round when propeller rotating

1. Dia-A=M4, Dia-B=38mm 
2. Pitch Ratio: 1.6 
3. Right Rotating  
4. Partially Submerged
5. Material Aluminum, CNC processing carefully, long life. Surface anodized processing, looks smooth and is not easy to rust.  
6. Weight: 4.3g  

NOTE: Product pictures for reference only .Because the product are many types, unable to every product take pictures, but quality and processing are the same. The actual product parameters  fit with the text description