All spinner nuts are made of 6061-T6 Aluminum-stick by CNC machines,having high precision,excellent concentricity,being suitable for engines of various brands with different specifications,moreover they have beautiful appearance as it can be anodized in different colors.*A stands for Anodized, *-1、2、3、4、5、6. 1-Red，2-Yellow，3-Blue，4-Black，5-White，6-Purple.
Aluminum spinner Prop Nut