The O2 Oxygen Sensor Socket is a durable and reliable tool made of Chrome Vanadium Steel, with a polished finish for a professional look. It features a 3/8" drive size and a 7/8" (22mm) opening, perfect for removing and installing oxygen sensors. With a compact size of 3.58 x 1.69 x 1.54 inches and weighing 9.1 ounces, this socket wrench is designed for efficiency and precision. The tool is sold as a single piece and is compatible with fasteners ranging from 0.375 inches. It does not require any batteries and is a valuable addition to any home or workshop tool collection.