The Snap-on Tools USA 7/8" Hex Oxygen/Knock Sensor Chrome Handle Wrench is a single item hand tool designed specifically for automotive use. With a 6 point drive type and SAE measurement system, this high-quality wrench from Snap-on is perfect for professionals and DIY enthusiasts alike. The chrome handle not only adds durability but also a touch of style to this essential tool for working with oxygen or knock sensors in vehicles. Like brand new! works perfect!