About this item APPLICATION --- The oxygen sensor socket set designed for the removal and installation of oxygen sensors, oil pressure switch, thermal sensor switch, and brake light switch on the vehicle. HIGH QUALITY --- Oil pressure sending unit master sensor socket is made of chrome-vanadium steel (CR-V) for extra strength and longevity, finished with black oxide to avoid rust. SIZE --- Oxygen sensor socket kit includes 22mm (7/8”), 27mm, and 29mm, fit with 3/8-inch and 1/2-inch ratchet drivers or extensions, the side cutout sections allow the sockets to fit over wiring harness and prevent damage to wires PACKAGE --- comes with a plastic carry case for easy storage, organization and carrying away. FEATURES Removes and Installs Hard to Reach Oxygen Sensors, Oil Pressure Switches, Oil Pressure Sending Units and Thermal Sensor Switches High Strength Chrome Molybdenum Steel Construction 3/8" Drive & 1/2" Drive Stores in a Plastic Blow Storage Case. SPECIFICATION 1pc 1/2'' Drive x 27mm (12 point) oil pressure sending unit socket. 1pc 1/2'' Drive x 29mm (6 point) pressure/vacuum switch socket with slot. Oil pressure sending units on late 1980 and mid 1990 GM vehicles. Designed to be used with 1/2" drive tool. 1pc 1/2'' Drive x 7/8''or 22mm (6 point) long oxygen sensor wrench socket with slot. 1pc 3/8'' Drive x 7/8'' or 22mm (6 point) vacuum switch socket with slot. 1pc 3/8'' Drive x7/8'' or 22mm (6 point) vacuum switch socket with slot. 1pc 3/8'' Drive x 1-1/16'' & 1''or 27mm (6 point) oil pressure sending unit socket. Special deep design fits oil switches up to 2-5/8". Can be used with a 3/8" drive ratchet or 1-1/8" wrench. 1pc 3/8'' DR x 7/8''or 22mm (6 point) short oxygen sensor wrench socket with slot.