Stainless Steel Stud Mount Flanged Hand Rail with Mounting Flange - 18 These Stud Mounted Flanged Hand Rail features integral 5/16"-18 threaded studs and installs with two 5/16"-18 nuts (not included). Constructed of formed 304 stainless steel for corrosion resistance. Design features flanged ends to provide a larger mounting surface for greater durability. Functional and attractive, with no visible mounting hardware.