Description: We use an Anti-Aging, Ultraviolet-Resistant ABS Thermoplastic with robust reinforcement. Their rugged design provides performance that you can rely on for years. Non-slip surface ?Durable sealed rubber strip. Removal knob design,Very Convenient! Come with 5mm screw hole diameter,Easy to install. Specification: Material: ABS Plastic Color: White Dimension(L x W x H): 42.5 x 31.5 x 2cm/16.7 x 12.4 x 0.8 inch Package Includes: 1 Piece Marine Access Hatch Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Color may be slightly different from the pictures because of different screen and light. Please kindly understand