This is the APC 6×4 Sport Airplane Propeller.
FEATURES
Lightweight injection molded nylon construction reduces rotating mass
for higher output and longer life
Reinforcing carbon fibers help maintain true, constant pitch at any
RPM.
Gray in color

SPECIFICATIONS
Length: 6″
Pitch: 4″
Hub Diameter: 0.50″ (12.7mm)
Hub Thickness: 0.25″ (6.3mm)
Hole Diameter: ?” (6.3mm)
Weight: 0.18oz (5.1g)