This is the APC Electric 22X12 RC Plane Propeller

Thin Electric
Use LPAR06E adapter rings
Includes one set of rings from LPAR06E

Pitch (inches): 12
Propeller Diameter (in.): 22
Hub Diameter: 1.38 in.
Hub Thickness: 0.54 in.
Shaft Diameter: 5/16 in.
Product Weight: 4.80 oz.
Color: GREY