answer from HQ!
This prop was designed having in mind only one thing, RACING!
Check out our full line of 5" props and HQprops
Propeller Diameter: 5.1inch
Pitch : 4.2
Blades : 3
Material : Poly Carbonate
Weight :4.9g
Hub Diameter :13mm
Hub Thickness:7mm
Shaft :5mm（ Compatible with POPO motor)
Adaptor Rings : NO
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