Dual Gear for CG 200cc-250cc Water Cooled / Air Cooled ATV, Dirt Bike & Go Kart. The item fits for CG200-250 Vertical Water/Air Cooled Engine. Left side item:upper side:14 teeth(diameter:29mm) bottom side:16 teeth(diameter:38mm)(please see picture) Height(left side item):42mm Right side item:upper side:18 teeth(diameter:36mm) bottom side:62 teeth(diameter:63mm)(please see picture) Height(right side item):26mm Inside hole diameter(right side item):10mm Two items installed together height:56mm