It is made up of 304-grade stainless steel, and the lens is made of plastic. Stainless Steel construction looks great and provides years of service. It’s very durable and lightweight, water and rust-resistant, and requires approximately 50mm of depth for mounting. It’s very easy to install, and great for interior Marine Transom Stern Light, compartment light, cockpit light, etc. Dimensions: Base Diameter: 3 inches, LED: 12V 18W, Red Light. Package Includes Pack of 1 Marine City 304 Grade Stainless Steel Round Flush Mount Caution White LED.