A polycrystaline diamond (PCD) 60-degree angle writing bit by VINCENT. This tool has 10mm shank, therefore it requires an adapter to be used on a 1/2 GAS toll holder. Use with adapter TYR 34008608 (10mm to 1/2 gas adapter with grub skrew). Use this tool for your most fine and accurate engravings in stone. See our YouTube video for an example of it's application. RPM: 6000. Feed Rate: 4-7 in/min.