This set is cut on the Y2 999A key blank and will work with the Y1 and Y2 and Y1R keyed locks that use the popular .019 increments.  Use your key duplicator to originate keys by code with these depth and spacing keys. Simply insert the key and make the desired cut in the desired location. Insert the next key and continue until you have made all of the cuts. These are cut on an electronic code machine.