Best method to cut adjustable shelf brackets?

I had put a shelf up using the single slot rail and bracket system and when I got done and stood back to take a look at it, and a shelf at

Brackets for Slot Shelving System, 180ALM12 Brackets for Adjustable Wall Shelves - Discontinued Color Bracket 24 38 L Single Hole

slot paling bagus Features a shelf retaining lip and a spring clip for stability and friction lock Brackets are vertically adjustable in 1 In increments Regular-duty, single

slot mega Now the slight divot on the underside of the laminate shelf allows the edge of the single rail bracket to rest or set into a groove thus making