TWO EE WERE USING A HAMMER TO DRIVE A RIB IN THEMINE FLOOR TO SET A TAIL PIECE. THE INJURED EE WAS WORKING ON BELT STRUCTURE IN THIS AREA. A SMALL PIECE OF METAL FLEW FROM THE HAMMER HEAD & LODGED IN THE EE RIGHT HAND.THE EE WAS WEARINGGLOVES, HOWEVER THE METAL STUCK THE EE ABOVE THE CUFF OF THE GLOVE.