Since our square steel gutters are not symmetrical, we offer both internal and external corners.An internal corner is used on an inwards corner that joins two walls together at a 90 degree angle on the property. These corners are fitted with fold over tabs that ensure any lengths attached to it are firmly locked in place with an easy fitting process.Please note, the internal corner does not feature a seal and should therefore be mounted directly with the gutter using steel glue. Once mounted, press the glued area down and bend the mounting plate. Finally, make a tight joint with glue on the edge of the gutter installed inside the corner. Please make sureandnbsp;that there isandnbsp;7cm overlap when joining corners with lengths.