It includes all the hardware required for installation (screws, mounting plates, and lock plates). Anti-corrosion material and reinforced plastic, durable, waterproof, rust-free, and lightweight. Widely used in equipment, ships, automation equipment, and the automotive industry. Embedded configuration and simple installation make this latch ideal for hatches, livewells, electrical accessories, and other compartments on boats or RVs. Specifications: Cut hole: Diameter 38mm Door thickness: 1-10mm Material: Plastic Color: Black Package Contents: 4 x Flush Boat Latches 4 x Mounting Accessories 8 x Screws Note: Light and different displays may cause the color of the item to appear slightly different from the real thing. Measurement allows an error of +/- 1-3cm.