ATR Tile Leveling Alignment System DIY Kit 2mm Cross Floors and Walls (301 pieces) Only System that leave clean grout line (no risk of spacers not breaking all the way) The only system removed without the use of force. Creates a lippage free surface Simple and quick to lay with only 2 elements: Spacer & Pre-Assemble Spindle. No Tools (GUN) needed! No expensive hand tools required - For the advanced professional a simple socket and cordless drill may be used to remove and install spindles.