Model Boat Brass Propeller 3 Blade M4 Right Hand, Left Hand 20mm-65mm Boat Prop
M4 Size - 4mm Thread. Model Boat 3 Blade Plastic Propeller M4 Right Hand, Left Hand 30mm-60mm Graupner. Available in sizes from 20mm to 65mm. Rotation stated is when viewed from the stern of the boat.