The 90° DecorTrim 2.6m Metal External Corner Trim Gloss Black 20mm can be used for covering up a joint where two boards meet at an external corner allowing any messy cuts or unsightly board ends to be hidden. This creates a much cleaner and professional finish. Length: 2600mm Size: 20mm x 20mm Colour: Black Construction: Metal This Gloss black metal external trim for wall corners is 100% waterproof and adheres directly to your wall panels making installation incredibly quick and easy. This also allows the 90° External Angle to be used with any wall panel, in any room, including your bathrooms, showers, and kitchens.