These propellers have a T mount and a tri-blade configuration.

Package Includes:

2 x CW HQProp T3.5X2X3Grey propeller
2 xCCWHQProp T3.5X2X3Grey propeller

Specifications:

Propeller Diameter: 3.5 inch
Pitch: 2
Blades : 3
Material: Poly Carbonate
Weight: 1.5g
Hub Diameter: 10mm
Hub Thickness:4.7mm
Shaft:1.9/1.5/1.9mm
Adaptor Rings: NO