10in Marine Porthole Round Black Portlight Stalinite Window Universal for RV Boat Yacht

4mm/0.2in thick tempered glass, rugged and durable, not easy to damage. Reserved mounting holes (without screws), easy to install, simple and convenient to use. Contains durable rubber ring seals for strong sealing, effective waterproof, reliable to use. The two fittings can be loosened to allow you to swing open the porthole. Casted and polished 316 stainless steel accessories, corrosion free synthetic fittings.