Enter the width in inches of your check. This has nothing to do with printing, it's just here so that you can judge how much room you have when you are setting things up.
Enter the length in inches of your check. Remember that this should be the entire length of the check, from perforation to performation. Decimal amounts (ie: 3.46) are ok.
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Click Cancel to discard the changes you have made in this dialog.
Click Ok to accept the changes made in this dialog.