It is made of stainless steel, smooth finish surface, aesthetically pleasing appearance, is rust and corrosion resistant, is sturdy and durable, long-lasting life. Marine U-bolts may be used where an eye bolt would be too small or extra strength is required. It is easy to install without modification, commonly used as deck hardware in highly corrosive marine environments. Dimensions: Stock Diameter: 5/16”, Thread Length: 1-3/8” (34.93 mm), Overall Length: 2-3/4” (70.13 mm), Center to Center Length: 1.28” (32.4 mm). Package Includes Pack of 1 Marine City Stainless-Steel 5/16 Inches Stock Bow Eye/U-Bolt.