The Performance Tool W84011 Thin Wall Oxygen Sensor Socket is designed to remove 7/8 in. (22mm) oxygen sensors that are inaccessible with standard O2 sockets. Its thin wall construction prevents interference with heat shields and other obstructions, while the cutaway slot accommodates the sensor's wire harness. Ideal for Audi, BMW, Mercedes, Mini, Porsche, VW, and other vehicles with clearance issues. Constructed from heavy-duty alloy steel with a black oxide finish. Compatible with a 3/8 in. drive ratchet or 1 in. wrench. Overall length is 3-5/16 in. with a 3/32 in. wall thickness.