Sockets are compatible with several applications. Comes in a blow molded case Set includes: OTC4673-1 29 mm Pressure / Vacuum Switch Socket; OTC4673-2 7/8" Vacuum Switch Socket; OTC4673-3 27 mm Oil Pressure Sending Unit Socket; OTC4673-4 7/8" Vacuum Switch Socket; OTC4673-5 1-1/16" and 1" Oil Pressure Sending Unit Socket; OTC4673-6 7/8" Long Oxygen Sensor Socket; OTC4673-7 7/8" Short Oxygen Sensor Socket.