A PCB drill bit with a 0.85 mm diameter.
Pack of 5
Copper-Clad Board, DOUBLE-Sided, FR-4, 3-Pack
End Mill, 5-Mil Diameter, Tapered 5-Pack
Router Bit, 31.5-Mil (0.80 mm) Diameter, 5-Pack
End Mill, 5-Mil Diameter, Tapered 10-Pack