A die-nut is a screwed block with or without a handle; die-nuts without handles are represented by Figs. 373 and 374, and are used for finishing a number of screws to one diameter without the need of measurement during the process. For this purpose all the screws are first screwed with either a screwed plate or with a pair of dies until the screws are but little larger than the screw in the die-nut, after which the screws are finished by screwing the nut upon each one by means of a spanner. By such usage die-nuts are not much injured through the small amount of metal taken off during use ; and such nuts may be made to finish screws of two or three inches in diameter. For convenience while finishing a large number of screws, each nut may have a handle, or the nut may be held in a frame resembling Fig. 376, such a frame being especially useful if the nut is to be used for a screw which is being made in a lathe. Die-nuts are always useful when the object is to make a number of screws similar to each other, but gauge-nuts are especially useful for long screws, because the greater the length of the screw the greater is the trouble of making it parallel and forming the entire thread to the proper shape, if a pair of dies are employed for the purpose. If the screw to be finished with a nut is in a vertical position, a spanner may be used to rotate the nut upon the screw, but if the screw in progress is in a horizontal position, a nut in a frame, or solid with a handle, may be used, because the weight of the frame is not so likely to injure one side of a thread while the screw is in a horizontal position as when the screw is in a vertical position.