1. Place the tiles on the squares where the tiles overlap, and mark the area where the outer diameter of the squares overlap with a pen or the like.

2. Next, place the ruler on the tile, align the mark with the line of the same diameter as the mass, and mark it with a pen or the like along the groove immediately above.

3. Cut the tiles according to the ruled lines.

*The joint width is basically 4 mm. If you want to increase the joint width, draw a line with a thick pen and cut it at the outer periphery of the line.