Pre-flashed and pre-assembled for protection against water damage. Can be used on a variety of siding exteriors including fiber cement, engineered wood, composite, cedar, and stucco claddings. Provides job site uniformity (no matter which crew sides the house). Saves time and labor (installs in seconds). Provides a clean and more finished look. Surface Dimensions: 8-1/2" x 11" Color: Arctic White Material: Fiber Cement Flange Dimensions: 1-1/2" Projection: 1" Round Knockout: 3.625" Dia Rectangular Knockout: N/A J-Channel Inside Dimensions: N/A