The QEP Wedge Tile Spacers are specifically designed for wall tile installation, ensuring precise spacing and alignment. They ensure uniform grout lines between tiles, making them ideal for porcelain, stone, marble, and ceramic tiles in vertical applications. Their unique wedge design allows them to be pushed in or out to adjust the position of tile up to 3/16", while effectively holding the tile in place. Perfect for leveling the first row of tile on a tub or straightening rows on a wall. You will save hours in time and money in situations when the bottom row of tile meets an uneven surface such as a non-level concrete floor.