Replacement T-nails: During use, if the steel nails are deformed and damaged, they can be replaced to extend the service life. Easy to replace, use a screwdriver to remove the screws and replace the T-nails. The nail will not damage the tile. Main function: Great tools for floor/tile/wall installation. The system ensures flatness between tiles and prevents tiles from moving during curing. Main application: It is suitable for tiles with a thickness of 8-12 mm, precise seam of 2 mm, and it is recommended to use it with a cross. Durable material: the tile levelers are made of PP, durable, sturdy, no deformation, reusable, easy to use. Package Included: The tile leveling system kit includes 50 spare tile levelers and 50 spare T-nails, enough quantity for long-term daily use.