Highlights:Size: 8"Fewer code infractionsCan be used for fixed offsets of 30 degrees slopeGreater angles are prohibited by UL Standard 103 and by the terms of the product listingRequired: Locking bands (2 packaged with each elbow kit) are to be used at each jointEach offset must be supportedElbows rotate 360 degrees to provide the exact orientation requiredInsulated elbows can be used at the same 2 air space clearance as chimney sectionsKit Includes: 2 elbows, 2 locking bands, one interior support and couplers