This is a milling bit especially designed for making 'isolation' based PCBs using the Roland iModela desktop milling machine.
'Isolation milling' is where the bit cuts a thin strip though the copper surrounding the actual signal path on the PCB. It's not necessary to mill out the whole non-signal area, just a thin strip to isolate/insulate one area of copper from another. You can read more about it in the Arduino tutorial in the resources section at the bottom.
- Material : Solid Brown Grade Carbide
- Shank : 2.35
- Machine : Roland 'iModela'
- Angle : 45 degrees
- Truncation / Tip width : 0.2mm
- Length : 50mm