Low Profile Box Mounting Bracket Set for Window Blinds - White Low Profile Box Mounting Bracket Set. Brackets can ONLY fit a headrail that is 2 1/4" wide x 1 1/2"tall. Color: White Brackets can be used for inside or outside mounting. Can mount to top, side, and back of window casing. This set includes a left and right mounting bracket. Each set can mount one blind. Screws not included.