The Quick Adjust System IVO Props allow you to adjust the pitch on the ground quickly turning the screw adjuster in the center of the prop. The supercams are installed on the square end of the torsional rod. Each supercam fits into the groove in the screw adjuster. Turning the screw adjuster causes each cam to rotate and turn the torsional rod, thereby twisting the blade and changing the pitch. Propellers are non-returnable.