Diameter: N/A . Used with sentinel and ultra temp chimney Designed for metal/corrugated roofs Fits all diameter of 1" and 2" chimney Eliminates need for standard roof flashing All required components included in one box Designed to safely waterproof the roof penetration of 2" chimney installations through metal or other corrugated roofs 10/12 roof pitch maximum KIT INCLUDES: One shield Four spacer channels Three shield mounting brackets Twelve #8 x 1/2" sheet metal screws Thirty six #9 x 1-1/2" truegrip GT w/washer wood screws One rubber boot flashing One roll of mesh screen One universal storm collar