Verstaex PVC Circle Window Surround Trim. They are built to fit Andersen CIR20, CIR24, CIR30, ACRD20, ACRD24, ACRD30, 100CI2020 and 100CI3030 circle windows using Versatex / Azek PVC. These PVC Window Surrounds are for decoration only and do not provide waterproofing. Your windows should be properly taped and waterproofed by an experienced contractor. It comes S4S 5/4 X 4 ( 1 inch x 3-1/2 inches actual ) or with a 3/4" x 3/4" siding pocket. They are CNC cut Versatex / Azek PVC for a perfect cut. These are the available sizes below with their inside dimensions measuring- 24-1/4 inside dimension to fit Andersen CIR20 28-1/2 inside dimension to fit Andersen CIR24 36-1/16 inside dimension to fit Andersen CIR30 23-3/8 inside dimension to fit Andersen ACRD20 27-3/8 inside dimension to fit Andersen ACRD24 35-3/8 inside dimension to fit Andersen ACRD30 23-5/8 inside dimension to fit Andersen 100CI2020 35-5/8 inside dimension to fit Andersen 100CI3030 Proudly Made in the U.S.A. using American made Versatex PVC. Free Shipping !! Typically ship in 1 - 2 weeks. Need a custom size? Just send us a message with your needs and we will quote it out for you. Please call 631-234-1090 or email if you have any questions [email protected]