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Honing is the final process used in the machining cylinder bores, either during manufacture or in re-sizing (re-boring). Honing is used as a process to both remove the final amount of metal to get a cylinder bore to within the required size limits, and to put a surface on the cylinder bore which will give good life span, and aid lubrication and oil consumption characteristics in use. Honing is not only carried out on cylinder bores for internal combustion engines but on compressors, hydraulics components and probably dozens of other applications. Engine manufacturers realized long ago that the honing on their cylinder bores was one of the key components to engine longevity and emissions control (and oil consumption). A lot of money is spent on large machines specifically for honing cylinders, developing the optimum finish for their requirements and measuring and assessing the effect differing quality of the honing finish.