These parts are made in 0.5mm Stainless Steel, which provides customers with peace of mind that they are guaranteed a lifespan of at least 100 years. A highly cost effective and environmentally friendly product, contractors and installers can be assured of a long lasting and high quality purchase. This 135 degree internal corner is designed to fit perfectly around the larger corners of your property such as conservatories, garden sheds or bay windows. Steering water around the angles of your property’s roof, the Stainless Gutta Standard Box Internal Corners are crucial components of your drainage system. Stainless Gutta Standard Box Dimensions Width: 90mm Height: 65mm