This set centers both steer axle wheels and brake drums to minimize wheel vibrations, brake pedal pulsations, and wheel hop. These sleeves are made specifically for the 'TAG' axles with Accu-Ride 19.5 inch wheels. When remounting the wheel/tire assembly onto a hub piloted mount, the wheel rests on the upper pilot. This can produce a gap on the other pilots, causing the off-centered condition. Simply slide the centering sleeves at 12, 8, and 4 o'clock positions, mount wheel and add lug nuts, torqueing to manufacturer specifications. The wheel is now completely centered.