This is a 7x5 Airplane Propeller this is a "tractor" (not a "pusher") Prop.
Computer-optimized design gives these props a thinner profile and more "bite" with less noise
Lightweight molded nylon construction reduces rotating mass for higher output and longer life
Reinforcing carbon fibers help maintain true, constant pitch at any rpm
Thickness at hub: 1/2"
Hole diameter: 1/4"