Schluter Kerdi-Kereck-F Pre-Formed 90° Waterproofing Outside Corners, 10-Pack are specially designed preformed, seamless corners that provide reliable waterproofing for the corners of Kerdi and Ditra assemblies, effectively preventing leaks. With a thickness of 4 mil, these corners help minimize build-up in the corners, ensuring a smooth and professional finish. This package includes 10 outside corners that are easy to install and made from durable polyethylene material. I for use with ceramic, porcelain, stone, and tile flooring, these underlayment corners ensure a fully water-tight seal at outside corners, enhancing the longevity and performance of your flooring installation. Model Number: KERECK/FA10