Ken Finney writes:

What a really need is a box and pan brake, but from what I see in the
pictures, it doesn't appear that it has individual "fingers", but only
one long bending surface. Am I correct?

No, there are assorted sizes (1", 2", 3", ...) that allow you to make any
width from 1 inch to 30 inches in increments of 1 inch. For fractional
widths, you simply space out some small gaps.