A PCB drill bit with a 0.85 mm diameter.
Pack of 5
End Mill, 5-Mil Diameter, Tapered 5-Pack
Copper-Clad Board, SINGLE-Sided, FR-4, 3-Pack
Copper-Clad Board, DOUBLE-Sided, FR-4, 3-Pack
End Mill, 3.9-Mil Diameter, Tapered 10-Pack