are useless as they make no sense! Viewed through a magnifying glass, these tips are not only missing a point, they aren't even perpendicular to the nozzle itself. Other small neck bits are fine, but VERY fragile.
Pros
Mini PCB Drill Bits: made of carbide, shank diameter about 3.175mm, total length about 38mm, suitable for PCB processing, FR-4 PCB, CEM-3, SMT, CNC machine, Mold, Plastic, PCB, Carbon fiber, composite panel, etc.