Sea-Dog Stainless Steel Stud Mount Grab Rail These Sea Dog stud mounted grab rails feature integral 516-18 threaded studs and install with two 516-18 nuts not included. Formed of 34 304 stainless steel for corrosion resistance and durability. The design provides a sleek, smooth handrail transition to the mounting surface of your boat. These rails are functional and attractive with no mounting hardware visible. Hand Rails With Studs Formed 304 StainlessPowder Coat Available in 4 Sizes Dimensions