Performance Tool W80591 1-3/16" Oil Pressure Switch Socket 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 Use with 1/2" drive ratchet or 7/8" wrench Heat treated alloy steel construction