If a number of pieces of tin-plate the same size and form are to be cut, it is usual to have a punch and die cut to the desired shape these are fitted to a press, and the pieces are then stamped out. If a limited number only is required, or if the pieces differ in size and shape, a circular hole smaller than the opening required is punched out with a hollow punch upon a lead piece; the nose of a pair of circular snips is then inserted through the hole and the metal cut away to form an opening of the shape desired.