TWO EE WERE INSTALLING ROOF BOLTS. THE BOLTER WAS NOT PRPERT ALIGNED WITH THE BOLT, CAUSING THE BOLT TO HANG IN THE DRIVING TOOL. ONE EE WAS HITTING THE DRIVING TOOL WITH A HAMMER AND THE OTHE R EE REACHED OUT TO GRAB THE DRIVING TOOL AND WAS STRUCK ON THE INDEX FINGER ON THE LEFT HAND, BREAKING OPEN THE SKIP FIRST AID WAS ADMISTERED ON SITE BUT THE NEXT DAY 7-18-02 THE FINGER INFE