The Metal Storm Collar is constructed of heavy duty steel and protects roof vent pipe from water run-off. Includes a bolt set for tight installation of the vent pipe collar and is available in 3 inch, 4 inch, 5 inch, 6 inch, 7 inch, 8 inch, 9 inch, 10 inch, 12 inch, 14 inch, 16 inch, and 18 inch sizes. Galvanized Steel Storm Collars or Stainless Steel Storm Collars Available.