Material:Aluminum alloy Standard:MUTCD's standard Surface Treatment:Alodine processing,chemically treated Alloy:5052-H38, 3003-H18,3105 and other materials Holes:3 8" holes for mounting Thickness:025",040"Ga ect. Shape:Rectangle, Square, Triangle, Octagon, Pentagon, Circle, Diamond, etc Sample:Available Feature:Rust resistance Usage:Traffic safety products