All of our stop signs are made of heavy duty .080 aluminum and meet DOT and MUTCD regulations. Aluminum signs are 30% lighter and have a longer life than steel signs. These stop signs will never rust, even in the harshest conditions. All of these signs come standard with 2 holes for easy mounting on any u-channel sign post and have high intensity reflective sign faces. The sizes range from 24 inch all the way up to 36 inch depending on what the job requires.