Six 10mm bolts hold the factory grille shell to the hood of the F-150. They work in conjunction with a set of clips to retain the shell. Once the grille was removed from the truck it was time to prep the billet inserts for installation. Each insert receives several threaded studs of varying length. Then, the inserts were set in place from the front side of the grille. No cutting is necessary to fit them into the grille shell.