Flange Slotted Window Trim and Rabbeted Trim are engineered to create beautiful, consistent, and long-lasting window surrounds by removing the installation challenges. Rabbeted trim is ideal for replacing existing trim. The cut flange easily covers existing siding. Ideal for new construction, the Flange Slotted and Rabbeted Trim has a 3/4" pocket, and, if using a vinyl window, the nailing fin will be hidden. The relief on the back of the board allows it to sit over the nailing flange without shimming.