Schluter Kerdi-Kereck-F Pre-Formed 90° Waterproofing Inside Corners, 10-Pack are preformed, seamless corners designed to provide reliable waterproofing for the corners of Kerdi and Ditra assemblies, effectively preventing leaks. Crafted from durable Kerdi material with a 4 mil thickness, these corners help minimize build-up in tight spaces, ensuring a clean and professional finish. This 10-pack a convenient and easy-to-install solution that s a fully water-tight seal at outside corners, making it an i choice for ceramic, porcelain, stone, and tile flooring projects. The product measures 4.875 inches in width and is made from polyethylene, combining strength and flexibility for superior performance. Model Number: KERECK/FI10