Sirra Tile Levelling Spacers are designed to improve tile installation speed whilst making it a breeze for the installer. Fine adjustments can be made via the tool supplied for complete accuracy, and once the job is finished the can simply be removed and reused time and time again. Sirra Tile Levellers keep the tile surface flush, and also prevents any unwanted movement during the curing process. Ideal for any DIY project or professional Tiler. Instructions: Insert the T-pin in the space between the tiles, then rotate 90 degrees so that the T-pin is now sitting underneath the tiles. Tighten the leveller so that both tiles are at the same level. Before the tile adhesive has completely cured (usually no more than 6 hours), untighten the leveller and rotate 90 degrees.