The 32121 set centers both Steer Axle wheels and brake drums to minimize wheel vibrations, brake pedal pulsations, and wheel hop. Simply slide the sleeves over the 22mm wheel studs and seat the face of the hub at the 12, 4, and 8 o'clock positions. Reinstall the composite brake drum and mount the aluminum wheel over the studs and onto the protruding diameter of the sleeve. Install lugnuts and torque in the proper sequence using the manufacturer's recommended torque specifications. California Residents WARNING