The Snap-on 9-Pin Axle Hub Socket, No. S6804, is designed to ease the removal and installation of axle hub bearing retaining nuts on 2011 to current GM trucks with 11-1/2" rear axles. The 1/2" drive impact socket is heat-treated to a lower hardness to add impact and ensure optimum strength and durability. The specialty tool is intended to help technicians repair GM trucks quickly and efficiently, according to the company.