4mm(0.15inch) thickness tempered glass. Overall Outer Diameter: 10inch/26mm. Easy "click-in" construction. Casted and polished 316 stainless steel accessories. Strong ABS Molded Design, Anti-Aging, Anti-, Ultraviolet . Round shape porthole for Boat/Yacht/RV/Industry Cars. free synthetic fittings and water-tight rubber seals. Temper Glass for Strength, Clarity, 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: . 7 3/4inch/197mm. Colour: black Material: 316 stainless steel + tempered glass Package Contents: 1 * Porthole Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.