QEP Wedge Tile Spacers for Wall Tile Spacing and Alignment are designed to ensure even grout lines between tiles during installation of porcelain, stone, marble, and ceramic tiles on vertical tile applications. Their unique wedge design allows them to be pushed in or out to adjust the position of tile up to 1/8 in. (3 mm), while effectively holding the tile in place. The PVC manufacture of these spacers make them strong to perform and lightweight to handle. They do not slip or slide on vertical surfaces, and will not compress. Pack includes 500 wedge spacers.