10" Inner Diameter Storm Collar Made in USA from 304 Stainless Steel Adjustable for Various Roof Pitches Installs with Sheet-Metal Screws The 10" Inner Diameter Storm Collar 304 protects against rain, snow and debris. It is adjustable for various roof pitches and installs with sheet-metal screws. This storm collar will fit any 10" rigid pipe and is adjustable with a flat head screw driver, or socket wrench.