Airport Symbol Sign Material:Diamond Grade 3M 4000 Series Diamond Grade

3M 4000 Series Diamond Grade (DG3): Guaranteed for 12 year outdoor lifespan

Reflective strips on contrasting trim make workers much more noticeable in low light and broad daylight

Speed Limit 65 mph is the second most popular speed limit sign that we sell

15" round aluminum with stub

They bolt directly to a 3" round post

Airport Symbol Sign Material:Diamond Grade 3M 4000 Series Diamond GradeSize: 24x24 We make all our signs from . 080 thick aluminum. Other companies use steel which rusts, plastic which cracks or warps, or a thinner gauge aluminum (. 060 or . 040) which bends or buckles. Material Details We use 3M reflective sheeting and 3M UV resistant inks. 3M offers the following on their sheeting: 3M 3400 Series Engineer Grade Prismatic (EGP): Rated for 5 7 year outdoor lifespan 3M 3930 Series High Intensity Prismatic (HIP):