3M AUTHORIZED. Manufactured with premium 3M reflective films and inks and meets every DOT requirement for outdoor parking and traffic signs. Diamond Grade Reflective Aluminum is 3x more reflective than Hi Intensity Grade REFLECTIVE. Signs have Engineer Grade reflectivity that makes sure they can be spotted at night DURABLE & LAMINATED. Heavy-duty rustproof aluminum has a 10-year outdoor durability rating backed by a 3M warranty. Graphics are protected from weather and abuse and graffiti can be cleaned off. Laminated signs outlast competitive unlaminated or overcoated signs INSTALLATION. All signs come with rounded, burr-free corners and pre-punched/pre-cleared holes. Signs mount to U-channel posts, square or round galvanized posts, wooden posts and chain link fences MADE IN USA. We have been making signs for over 100 years in the US. We know which signs work and which signs are durable outside