GWS now offers 3-Blade versions of their popular DD series propellers for modelers that need a bit more ground clearance, or for those that want a more scale look on certain aircraft. The GWS 5x3x3 prop has a 3mm center hole pre-molded, and the hub measures 11.2 mm in diameter and 6.1 mm thick. The hub can be drilled out to 1/8", 4mm or 5mm to fit your prop shaft requirements. This twin-pack contains one each of the normal rotation and reverse rotation props. These are great for setting up a twin engine plane with counter-rotating engines to eliminate the torque problems when both motor turn the same direction. According to the widely accepted Maximum RPM formula of 100,000/D for GWS DD series props, the 5x3 DD props should not be used over 20,000 RPM. GWS