Fits 1 1/16" Switches Up To 2 5/8" Long, Found on Newer GM and Chrysler Vehicles. Fits 1 1/16" oil pressure sending unit (gauge type), found on most all 91 and newer GM vehicles. Also fits 87 and newer Chrysler vehicles with combination light and gauge oil pressure switches. Use with 3/8" drive or 1 1/8" hex.