This is an APC 18x10 Electric Propeller.
FEATURES: Composite propeller construction
Thin propeller ONLY designed for Electric use
INCLUDES: One propeller
SPECS: Center hole diameter: 1/4"
Propeller diameter: 18"
Propeller pitch 10
COMMENTS: The propeller comes with five locating rings:
the locating ring combines with the hub to create a precision fit.