Tool set for working with oxygen sensors. The set includes standard 6-sided, low-profile heads with wire slots. They allow you to remove oxygen sensors without disconnecting the wires, and the compact shape provides extra strength, even in hard to reach places. The kit includes an extra-deep head for 3/8" drive, a low-profile socket head for 3/8" drive, an offset socket head for 1/2" drive, and two bits for cleaning and repairing damaged threads. All are made of high-strength chrome-molybdenum and solid steel, coated with black oxide to prevent rust.