A stone tool manufactured from a flake by chipping (pressure-flaking) it on two edges at one end so as to leave a sharp point. Gravers were to cut or score soft materials such as bone, shell, wood, and antler; perhaps for punching leather and other purposes. The term also refers to a type of metalworking tool which comprises a number of subtypes, though all are hand-held, hard, and sharp and are used to cut or engrave metal. Such a graver has a metal shaft that is cut or ground diagonally downward to form a diamond-shaped point at the tip. The angle of the point affects the width and depth of the engraved lines; the point is guided by thumb and forefinger.