This is for installing a new center support bearing on your E46 driveshaft without risking damaging the bearing. Simply apply some lubricant where the bearing will seat onto the driveshaft and slide bearing on. Then use the tool to hammer in the bearing. It is easier to do with 2 people or if you can stand up and balance the driveshaft with your legs (Ask me how I know). Use the specified automotive-grade material, keep the tool square and inspect the serviced component before reassembly.
