GM Application Specific: This drive socket is designed for use with other automotive suspension tools to service the car shock absorber on an X or J body type GM vehicle Specialized Suspension Tool: Holds shock shaft in place while removing the top nut on X and J body GM cars; Shock tool for installation, removal, or replacement Double D Compatibility: Use with 3/8 inch drive tool; Fits 6.1 millimeter x 8 millimeter Double D stem found on many General Motors OEM suspension systems Heavy Duty Durability: High utility shock absorber sockets made with heat treated chrome vanadium steel for lasting strength and durability