ABN 3 Piece 3/8" Drive Oxygen Sensor Wrench Socket Set Removes and installs oxygen sensors on most vehicles Includes 2 7/8" 3/8 Inch Drive Vacuum Switch Sockets and One 7/8" x 1/2" drive Oxygen Sensor Socket Constructed of vanadium and molybdenum steel for strength and durability Finished with Black Oxide to prevent rust Comes in a molded case for protection and easy transport Drive Size: 3/8&#034; Includes: (1) 3/8&#034; Drive x 7/8&#034; Vacuum Switch Socket, (2) 3/8&#034; Drive x 7/8&#034; Oxygen Sensor Sockets.