SPI Supplies Diamond Scribe Pencil
These high precision scribing tools have polished diamonds, each carefully positioned to put the hardest face at the working end of the tool to result in the longest possible useful lifetime. The hexagon shaped is aluminum with a length of 6 inches (152.4 mm) and a diameter of 0.25 inch (6.35 mm)
Although the low cost might suggest otherwise, these diamond scribing tools really are precision made instruments and are used for scribing lines often times on expensive substrates which must be kept free of contamination. That is why we recommend a "blow off" with a duster each time after use, thereby avoiding any cross-contamination between different substrates.