The standard size is a 10” height and a 5” flange but square wraps are available in any size. Made from 60-mil TPO and PVC, they are available in white, gray or tan.
Square wraps are made to order - be sure to note whether a 4" x 4" is wood or metal
Specify whether a split or non-split square wrap is desired.
Plus angles - if split, overlap will be on the back/upside