Floor Tile Levelling System was developed to bring a perfect installation for all floor surfaces covered with tiles. It ensures that your tile installation will be levelled on the point tile to tile (each tile is levelled by all tiles around it). Product features400 Clips (Also Available To Buy Separately) 200 Wedges ( Also Available To Buy Separately)Frequently Asked Questions!! * CAN I USE THE T-LOCK SYSTEM ON WALLS? (A) Yes, the T-Lock system can be applied to any surface. * HOW MANY CLIPS WILL I NEED?(A) We created an Estimation table to help determine your exact needs. Please refer to our image section to view our estimation table.* DOES IT MATTER WHAT SIZE WHITE CLIPS I USE FOR MY GROUT LINE?(A) No, you can always use a smaller grout size clip and use our Tile Crosses to make up the difference. By using this trick, you can reuse more of your clips, and it offers the installer greater flexibility. * WHY WON’T MY CLIPS BREAK CLEANLY BELOW THE TILE SURFACE?(A) This may be because the breaking of the clips is not done parallel to the grout line. One should always strike the sides of the clips with a rubber mallet or safety shoes parallel to the grout line. Another possibility is the tile work was left to dry with excess adhesive on the tile edges. This can be avoided by cleaning the edges with a sponge when the adhesive is still fresh. *WHY IS IT THAT SOMETIMES MY GROUT LINE BECOMES WIDER WHEN I PUSH THE WEDGE INTO THE CLIP?(A) It is important to pay attention to the direction that one is placing the wedges. For best results, insert the Blue wedge towards the already installed tiles. -* CAN THIS BE USED OUTDOORS?(A) 100% - Perfect Level Kit is great for Indoor & Outdoor Usage.