Powerbuilt 648444 3/8" Drive Oil Pressure Socket Made to be the most reliable tools in the market today Tool solutions for most all situations Built to exceed tool standards Removes and installs 1 inch and 1-1/16 inch hex oil pressure sending units found on most engines Drive socket features a recess for switch body Socket can be turned with a 3/4 inch end wrench on the external hex Chrome vanadium steel for strength