The Titan Tools 51704 oxygen Sensor socket fits O2 sensors with 7/8" or 22mm head sizes. The extra long 2-1/2" deep socket easily removes long sensors and the Cutaway side conveniently allows for wire clearance. The design allows for use with a 3/8" drive ratchet or breaker bar or a 7/8" wrench. This socket also works on vacuum switches and other 7/8" or 22mm fasteners that may require wire harness clearance.