Here you have the basic 1 inch Cluster Gear Main Shaft. You also have the 6 Spacer Rings and the Center Tube. These items all go into the Cluster Gear with about 112 Roller Bearings. You take the main shaft and install it big end down. Then you install the tubular spacer and one Bearing Race Ring. Then put in 28 bearings in one row, another Bearing Race Ring, 28 Needle Bearings and one last ring