Sometimes you just need a third hand. These mini vises can make any gunsmithing job quicker and less frustrating. Small measures .050" to .125" diameter and Large measures .115" to .188" diameter. Notes:May also be used as a hand vise for small drill bitsThis is intended to hold a shotgun bead so it may be screwed into a tapped hole, it is not intended for driving twist shank beads into untapped holes and may break if used for that purpose.