This 11-piece sensor & sending unit socket set is used for the removal and installation of oxygen sensors, oil pressure sending units and vacuum switches. It is suitable for use on most vehicles thanks to the variety of sizes and styles. The toolset can be used with 3/8\" and 1/2\" drive ratchets (not included). This toolset is made of high-strength steel for sturdiness and durability. All pieces are organised in a blow-moulded case for easy storage and transportation.