The Performance Tool W80591 Oil Pressure Switch Socket is a must-have tool for any mechanic or DIYer who needs to work on oil pressure switches in their vehicle. Made of heat-treated alloy steel, this socket is durable and built to last. It fits 1 3/16 size units on 1987 to current GM including Chevy, Buick, Cadillac, Oldsmobile and Pontiac with 2.0, 2.5, 2.8 and 3.0 Liter engines, and is compatible with 1/2 drive ratchet or 7/8 wrench. With its precise fit, the Performance Tool W80591 ensures accurate and reliable readings every time, making it an essential tool for any automotive repair work.