Removes and installs the hub bearing retaining nut found on some GM GMT900 platform trucks The socket has 9 pins to fit the new style retaining nut found on 2-wheel and 4-wheel drive Cheyenne, Silverado, Escalade, Sierra and Avalanche trucks with 10.5 or 11.5 ring gear This item is a 2 pack of the base item LIS-31550.