ShadeMount rests on top of the deck rail and secures to the balusters below. To determine the correct size, measure the overall width of the top of your deck rail.

Width of 3″ to 3.75″ – ShadeMount 4
Width of 5″ to 5.75″ – ShadeMount 6
Width of 6″ to 6.75″ – ShadeMount XL