Stepped PVC Circle Window Surround. They are built to fit Andersen CIR20, CIR24, CIR30, ACRD20, ACRD24, ACRD30, 100CI2020 and 100CI3030 circle windows using Versatex / Azek PVC. Simply level and install. 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]