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. Skin-packed Shipping wt. 5 oz.