Designed for the removal and installation of oxygen sensors, oil pressure sending units, and vacuum switches. Contents: 1 – 1/2-in. Drive oil sender socket, 1-3/16-in. (29-mm): fits 1-3/16-in. oil pressure sending units found on late-80’s and mid-90’s GM vehicles. 3-1/2-in. long (90-mm). 1 – 3/8-in. Drive PVS, TVS, and O2 socket, 7/8-in. (22-mm): removes and installs vacuum switches with a ...