Slotted nut / Castle nut, M12x1. Commonly used for (but not limited to) 500cc, 700cc and 800cc engines, such as the Hisun 500cc, Hisun 700cc and Hisun 800cc 4x4 ATVs and Hisun 800cc UTVs, as well as many other clones, rebrands and similar displacement [More Info]