Do you want to remove all the guesswork for what size drill bit you need to add holes to your full size helmet for clips and snaps? Now you can. Add this drill bit to your order so you can add holes to your helmet worry free. It's the perfect size to add anything you might need to your full size helmet. The bit has a 1/4" hex shank so it can be easily used by most cordless drills or screwdrivers.