Practical Diamond Painting Ruler with Offset Line Grid for Round Stones 19cm x 3cm Material: stainless steel. Easily lay straight rows with this practical helper. The ruler has a total of 9 rows of 64 holes (total 576 holes). Simply place the ruler on the desired place and then place the diamond painting stones in the holes provided. So you can quickly and safely get straight lines and an even laying pattern. Thanks to the flexible material, you can then lift the ruler upwards. Note: With our rulers you can create diamond painting stones independently and creatively and create your own borders and borders. However, the rulers are not suitable for laying the motif canvases.