This is the APC Electric 16X10 RC Plane Pusher Propeller

Thin Electric Pusher
Reverse Rotation
Use LPAR06E adapter rings
Includes one set of rings from LPAR06E

Pitch (inches): 10
Propeller Diameter (in.): 16
Hub Diameter: 1.00 in.
Hub Thickness: 0.48 in.
Shaft Diameter: 1/4 in.
Product Weight: 1.83 oz.
Color: GREY