The durability of dies and punches depends to some extent upon the nature of the work upon which they are used. Further, the work to be done by these tools governs the point as to the amount of accuracy and finish that shall be given to them. It is, therefore, necessary that care and judgment be exercised upon this point, for when the metal after being cut into blanks has to be stamped, or raised and clipped as often is the case, the cutting tools need not be so accurate as they would necessarily have to be if several pairs of tools were producing similar blanks, which may have to undergo many processes before finally coming together and be interchangeable when being assembled. The cutting-out tools for such articles as cycle chain links, quick firing shells, small arms ammunition, type writing machines, cycle and motor car parts, electrical apparatus, jewellery, locks, musical instruments, stencils, watches, or any similar delicate work, must necessarily be made very accurate and be of first-class finish; whereas in the case of such articles as stamped hollow-ware, coal hods, elevator buckets, trunk trimmings, kitchen utensils, agricultural implement parts, hinges, lanterns, shovels, etc, a small fraction of an inch larger or smaller in the size of the cutting-out tools, or a slight variation in their shape would be of small consequence.