31510 Axle Nut Socket, 9 Pin for GM. Full floating hubs are held on with a circular nut that is engaged by the 9 pin socket for removal and installation. Used to Remove and Install the Hub Nut on 2020 and Newer Silverado and Sierra 2500/3500 Trucks With 11.5″ and 12″ Dual Rear Wheel Axle Hubs.