Prop girder adapter is made of 6061-T6 Aluminum-stick by CNC machines,having high precision,excellent concentricity,light weight and good rigidity,being convenient for   installing and removing ,being good for cooling motors,having beautiful appearance as it can be anodized in different colors.Also,it is very useful and economical.Various specs can be used in different motors and folding propellers.Prop girder adapter(cone nut)