MARINE CITY 304 Stainless Steel Rail Mounted Flag Staff & UV resistance Black Plastic Flag Pole Base with a pair of Plastic Clamps, to be rust resistant, strong endurance, durable in all conditions, even salt water. Stainless Steel Construction, looks great and provides years of service. The flagpole was strong at high speed and the flag fluttered. Suitable for yachts, marines, RVs, fishing boats, and so on. Easy to install and easy to adjust Clamps up and down to fit your flag size, easy and fast to replace flags. Dimensions: Pole Diameter: 1/2” (12.7mm); Length: 21" (533.4mm); Flag Size:12 Inches X 18 Inches; Black Plastic Flag Pole Base: Fits 7/8 " to 1 "Tube. Package Includes 1 SET MARINE CITY 21" Stainless Steel Rail Mounted Flag Staff and Black Plastic Flag Pole Base with 12 Inches x 18 Inches US Flag.