Base Size: 12" Width X 16" LengthFor Pipe Size: 4"Roof Pitch: Up To 45 DegreesMaterial: ThermoplasticColor: BlackPatented Positive Double Seal Ensure Leak-Free Fit Around Vent StackNo-Caulk Collar Allows Plenty Of Room For Expansion And Movement Of Pipe While Maintaining Leak-Proof SealFits Roof Angles From Flat To 45 DegreesFits All Types Of Pipe Including Copper, Cast-Iron, Plastic, Aluminum, Galvanized And MoreWill Not Warp, Crack, Corrode Or Cause Roof Discoloration