inches vs metric

[deviantollam]

i'm told that some of the images of key charts may be in hundredths of a millimeter as opposed to thousandths of an inch. the latter is the standard in most lock references and published charts. i'll double-check things to see if we can bring all of these into one unified standard... even if metric is better overall, i'd prefer to match most published resources (and most pin charts inside of pin kits, for example, are in inches)