Put the Center Screw through the Installer and bearing and through the knuckle. Put an Adapter on the back to block the Large Nut and turn the Center Screw with your impact wrench. The Large Nut will travel down the Center Screw to the Adapter and then the Bearing will move into the steering knuckle where it will be squared and seated. Use the same procedure, placing the hub on the Center Screw against the Installer, put the Center Screw through the knuckle and use the Adapter and Large Nut as before. Turn the Center Screw with your impact wrench and the hub will turn into the bearing, taking the trapped rotor with it, too.
Alignment is unchanged.
There are two Center Screws, one in each case. Also included is an Adapter for pulling the tapered shafts found on Ford front wheel drive vehicles.