Lindab Rainlines 90 internal gutter angle can be secured to a gutter with an RSK gutter joint. You need 2 per angle. Lindab HB polyester painted steel guttering Anthracite Grey is an incredibly popular and attractive guttering colour and this system can be used for new buildings and refurbishment projects to match any external decoration. It could also be used as a subtle guttering system and installed in projects where guttering needs to appear discreet. HB polyester painted guttering from the Lindab Rainline collection is coated with a layer of 275g of zinc that wont discolour or rust, meaning this guttering system offers a solution that wont split, leak, shrink or fade. This modern and cost-effective half round guttering system is low maintenance, requiring only the occasional wipe down. Its the perfect solution for homeowners who dont want the fuss of constant upkeep but would like to install a durable, long-lasting gutter system. Manufactured from lightweight galvanized steel, the gutters and downpipes can be fit flush to the wall in order to avoid people climbing the building. All guttering in the HB polyester painted Lindab Rainline range comes with a 15-year warranty on the HB polyester painted coating and has a 70 year life expectancy.