Gravel Guard is made of 28 or 26 Gauge Steel, ¼" or ½" Rise and 3" or 2" Face, 10' long. The Material is Galvanized Steel (ASTM A-653) or Zincalume (Galvalume) (ASTM A-792), 26 or 28 Gauge, Mill Finish or Painted, High Rise or Low Rise, 2" or 3" Face. Gravel Guard is also known as Gravel Stop. It directs runoff away from the structure, and also helps to contain gravel and tar on flat roofs. For architectural, residential, and commercial roofing.