Key Features Passes 1000 hrs in salt spray testing Deck screws combo drive - bugle head coarse thread - sharp point 5# box 1000 hour tested gauge x lgth 9 inches x 3 count per 83 pounds Use for exterior deck and railing projects where rust resistance is important. Use for exterior deck and railing projects where rust resistance is important. Use for exterior deck and railing projects where rust resistance is important.