Tab Dimensions
 
Length:
This is one of two dimensions necessary when specifying tab design. The length is measured along an imaginary line that extends through the middle of the tab. To determine the length of each tab, you must know the average length of your titles.
Extension:
This dimension is also needed when specifying tab design. Extension is the height of the tab, measured from the edge of the index sheet to the top of the tab, as shown here. Standard is 1/2”.

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