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

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

U-Jack™ will pay for itself the first time you use it

Whether you are driving posts into grass or dirt or needing to pound a post directly through blacktop

Tapered design enables stacking

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):