Operation steps: 1. Adjust the L-shaped needle position and leave the seam >1.5MM for better use with the cross card 3. Within 3-5 hours of construction, before the tile glue is dry and solid, reverse rotate 90 degrees to remove it 2. Insert the L-shaped needle along the gap, rotate the needle 90 degrees and stick it at the bottom of the brick, buckle the handle and level it 4. Complete the leveling effect. The surface of the tile is smooth and beautiful