The Grainger 14H704 is a 14-inch diameter, 7-blade, aluminum propeller for radio-controlled model airplanes. It has a pitch of 4 inches and is designed for .40 to .46 size 2-stroke glow engines up to 1.20 cubic inch displacement. The propeller is constructed of 7075-T6 aluminum alloy for strength and durability. It has a precision CNC-machined blade shape for peak performance. The propeller comes with a prop saver rubber spacer and 8mm prop adapter. Recommended for 40% to 60% scale warbird models. Made in the USA.