Material: Plastic Size: 51mm/57mm Color: Red, Blue, Black, White 100% Brand New and High Quality Name: Propeller Spinner Propeller Hub for Electric/Oil-Driven Plastic Propeller mainly refers to the size of the aircraft hub and the propeller hub fixed plate, rather than paying too much attention to the matching between the propeller hub and the propeller. Subsequently, we provide the maximum size of the propeller suitable for each propeller hub (taking GEMFAN APC saber propeller as a reference). Because the size of each manufacturer's propeller is different, the height and diameter of the engine's propeller clamp or the thickness or length of the engine shaft should also be considered. Currently, all cowlings can only be matched with positive paddles, due to the different shapes of the paddles, the length and size of the matching can only be a rough reference, the rigorous point is to take out the physical paddles and cowlings, practical installation can be successful! Please choose according to your own needs, if the purchase is wrong, bear the consequences yourself Package Includes: 1 x Propeller Spinner