Check out these nut inserts now available in Black Oxide coated steel. The steel version will take more abuse. If you prefer to bolt your body on, these are perfect! These are 3/8" course outside and 1/4" course on the inside. Just drill a 3/8" hole in your interior or aluminum angle body brace and install the nut insert then gently tighten up the serrated nut on back side. Now you have a 1/4" course thread to bolt your body panel to. We sell these in a 10 pack, or a 50 pack.