My apologies, should of been more specific. I'm actually just trying to find out what size of screwdriver tip, i.e. (0,00,000). I tried to tighten one of these screws with a screwdriver I already have (not sure of the size), and it seems to be stripping the head on the set screw. I can't seem to be able to get the set screw tight enough to keep the bolt handle from spinning. Thanks Again