As the ogee system is not symmetrical, internal and external corners are different fittings.The product image clarifies the difference but the most common use for an internal 135 degree angle is at the point where a bay window connects to the main fascia line on the roof.
The Cast Iron H16 Ogee Gutter Internal Angle - 135 Degree x 125mm Primed is ideal for gutter installations that require a specific internal angle to fit specific roof pitches or slopes.
