Boatbuilders use Oval head screws to attach a wide variety of metal trim to decks hatches and other surfaces that people contact regularly. The oval head projects above the surface but because it is gently rounded it doesnt tend to snag on things as easily as a protruding flat head screw. And Silicon Bronze is a great choice--it's great for corrosion resistance. We recommend pre-drilling twice (once for the root and once for the shank) as well as using a screw lubricant to avoid breakage. All screws are threaded for 2/3 of the shank.