Provides a good ground for test light and multimeter diagnostic useEspecially useful in the auto industry where testing isEspecially useful in the auto industry where testing is most difficult due to increase of plasticsUniversal design fits any power plugEven provides ground in dead power plugsManufactured from spring steel and injection molded plastic for lifetime trouble free operationBright orange color will make it easily visible in your tool boxMust have tool for diagnosing todays automotive electrical problems quickly and safely