Private Drive Sign, No Trespassing Private Road Sign, 3M Engineer Grade Prismatic .080 Reflective Outdoor Aluminum, 18" x 12" - By My Sign Center, A87-236RA Made in the USA. Pre-Drilled Holes for Wall, Post or Fence Mounting. Up To 7 Years Outdoor. Made Out of 3M Engineer Grade Prismatic .080 Reflective Aluminum. A Clear Polyester Over-Laminate Is Added to Give it Extra Protection with A Nice Glossy Look.