Description: 4mm(0.15inch) thickness tempered glassOverall Outer Diameter: 8 inch/210mmEasy "click-in" constructionCasted and 316 stainless steel accessoriesStrong ABS Molded Design, Anti-Aging, Anti-, Ultraviolet Resistant.Specification:- Round shape porthole for Boat/Yacht/RV/Industry - Corrosion free synthetic fittings and durable water- rubber seals- Temper Glass for Strength, , and Chemical Resistance- The two fittings can be loosened to allow you to swing open the porthole- Easy to install, pre-drilled countersunk fastening holes (screws not included)- Diameter Opening w/ Open Window: Approx. 7 3/4inch/197mmName: Round PortholesSize: 8 inch 21cm (21.5cm)Fit: Boat RVType:SFPP2-02Material: plasticcolour: blackPackage Contents:1 x Round PortholesOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.