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This is a 5.7x3 Airplane Propeller that is a "tractor" (not a "pusher") Prop.
Thickness at hub: 1/2"
Hole diameter: 1/4"
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