Dremel Engraving Cutting Bit (110) - Cylindrical-Shaped Engraving Cutter for Detailed Carving and Engraving with Rotary Tool, Diameter 1.9 mm - - Amazon.com
HQMaster CNC Engraving Bits, V Bit Cutter 10 Pack 0.1mm Tip Tungsten Steel Titanium Coated Flat Bottom Sharp Cutting Router Rotary Tool Set for PCB PVC Wood Acrylic Metal Aluminum - - Amazon.com