QEP 99703 LASH Tile Leveling System Wedges are designed for quick installation, the LASH® Tile Leveling System reduces costly call backs by ensuring that the finished floor surface is lippage-free. It is the perfect system to use with large-format rectified porcelain, thin porcelain tile, marble and stone where narrow grout joints are required. This fast, simple system is the most cost effective installation method on the market to eliminate lippage.