NO MORE HASSLE: The Cartman Oxygen 02 Sensor Socket 7-Piece Tool Kit – 22mm (7/8” Inches), 27mm, 29mm – All Vehicle O2 Removal and Installation is for inspection, removal, and installation of hard-to-reach oxygen sensors, oil pressure switches, oil pressure sending units, thermal sensor switches, vacuum switches, and brake light switches; Each socket is permanently etched with size marking for your convenienceMATCHES YOUR CAR: Universal fit for Audi, BMW, Citroen, Mercedes, Peugeot, Renault, Skoda, Vauxhall/Open (GM), and Volkswagen; Sizes include 22mm (7/8”), 27mm, and 29mm; For both heated and non-heated oxygen sensors; Compatible with 3/8-inch and 1/2-inch ratchet drivers or extensions; Side cutout sections allow the sockets to fit over wiring harness and prevent damage to wiresBUILT TO LAST: Constructed from chrome-vanadium steel (CR-V) for extra strength and longevity; Tools have a light coating of oil to protect them from rustingEASY STORAGE: Heavy-duty 9” x 2.25” x 8” inch (22.9cm x 5.7cm x 20.3cm) plastic blow-molded carrying case for easy transportation, safe storage, and quick organizationCONTENTS: Package includes (1) 29mm pressure/vacuum switch 6pt socket + (1) 22mm (7/8 inch) vacuum switch 6pt socket + (1) 22mm (7/8 inch) vacuum switch 12pt socket + (1) 27mm oil pressure sending unit socket + (1) 1-1/16 and 1 inch oil pressure sending unit socket + (1) 7/8 inch long oxygen sensor socket wrench + (1) 7/8 inch short oxygen sensor socket wrench + (1) carrying case