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. Design:Removal knob Surface:Non-slip Item type:Boat Accessories Marine Item name:Marine Access Hatch Item name:Boat Access Hatch Item type :Boat Hardware Item type :Yacht Accessories Item name :Marine Access/Deck Hatch Item name :Boat Access/Deck Hatch colour:white Material:plastic size(L x W x H):42.5 x 31.5 x 2cm/16.7 x 12.4 x 0.8 inch Package Contents: 1*Access Hatch Only the above package content, other products are not included. Note: Light shooting 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.