CTA Tools 2060 Combination Vacuum Switch/Oxygen Sensor Socket Universal Slotted Socket Design Services All 7/8-Inch (22-Millimeter) Hex Vacuum Switches and Oxygen Sensors Use with 1/2-Inch Square Drive Tools Can Also be Used with 7/8-Inch (22-Millimeter) Wrench Heavy-Duty Construction Allows for Strength and Durability